diff --git a/package-lock.json b/package-lock.json
index 21b17ed..c94e8fc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
       "license": "BSD-3-Clause",
       "devDependencies": {
         "benchmark": "^2.1.4",
-        "eslint": "^5.10.0",
+        "eslint": "^5.16.0",
         "gulp": "^3.9.1",
         "gulp-benchmark": "^1.1.1",
         "gulp-eslint": "^5.0.0",
@@ -93,9 +93,9 @@
       }
     },
     "node_modules/acorn": {
-      "version": "6.0.4",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.0.4.tgz",
-      "integrity": "sha512-VY4i5EKSKkofY2I+6QLTbTTN/UvEQPCo6eiwzzSaSWfpaDhOmStMCMod6wmuPciNq+XS0faCglFu2lHZpdHUtg==",
+      "version": "6.4.2",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.2.tgz",
+      "integrity": "sha512-XtGIhXwF8YM8bJhGxG5kXgjkEuNGLTkoYqVE+KMR+aspr4KGYmKYg7yUe3KghyQ9yheNwLnjmzh/7+gfDBmHCQ==",
       "dev": true,
       "bin": {
         "acorn": "bin/acorn"
@@ -105,24 +105,28 @@
       }
     },
     "node_modules/acorn-jsx": {
-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.1.tgz",
-      "integrity": "sha512-HJ7CfNHrfJLlNTzIEUTj43LNWGkqpRLxm3YjAlcD0ACydk9XynzYsCBHxut+iqt+1aBXkx9UP/w/ZqMr13XIzg==",
+      "version": "5.3.2",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.2.tgz",
+      "integrity": "sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ==",
       "dev": true,
       "peerDependencies": {
-        "acorn": "^6.0.0"
+        "acorn": "^6.0.0 || ^7.0.0 || ^8.0.0"
       }
     },
     "node_modules/ajv": {
-      "version": "6.6.1",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.6.1.tgz",
-      "integrity": "sha512-ZoJjft5B+EJBjUyu9C9Hc0OZyPZSSlOF+plzouTrg6UlA8f+e/n8NIgBFG/9tppJtpPWfthHakK7juJdNDODww==",
+      "version": "6.12.6",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+      "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
       "dev": true,
       "dependencies": {
-        "fast-deep-equal": "^2.0.1",
+        "fast-deep-equal": "^3.1.1",
         "fast-json-stable-stringify": "^2.0.0",
         "json-schema-traverse": "^0.4.1",
         "uri-js": "^4.2.2"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/epoberezkin"
       }
     },
     "node_modules/ansi-colors": {
@@ -138,9 +142,9 @@
       }
     },
     "node_modules/ansi-escapes": {
-      "version": "3.1.0",
-      "resolved": "http://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz",
-      "integrity": "sha512-UgAb8H9D41AQnu/PbWlCofQVcnV4Gs2bBJi9eZPxfU/hgglFh3SMDMENRIqdr7H6XFnXdoknctFByVsCOotTVw==",
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.2.0.tgz",
+      "integrity": "sha512-cBhpre4ma+U0T1oM5fXg7Dy1Jw7zzwv7lt/GoCpr+hDQJoYnKVPLL4dCvSEFMmQurOQvSrwT7SL/DAlhBI97RQ==",
       "dev": true,
       "engines": {
         "node": ">=4"
@@ -159,9 +163,9 @@
       }
     },
     "node_modules/ansi-regex": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
-      "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.1.tgz",
+      "integrity": "sha512-+O9Jct8wf++lXxxFc4hc8LsjaSq0HFzzL7cVsw8pRDIPdjKD2mT4ytDZlLuSBZ4cLKZFXIrMGO7DbQCtMJJMKw==",
       "dev": true,
       "engines": {
         "node": ">=4"
@@ -467,31 +471,19 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/caller-path": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/caller-path/-/caller-path-0.1.0.tgz",
-      "integrity": "sha1-lAhe9jWB7NPaqSREqP6U6CV3dR8=",
-      "dev": true,
-      "dependencies": {
-        "callsites": "^0.2.0"
-      },
-      "engines": {
-        "node": ">=0.10.0"
-      }
-    },
     "node_modules/callsites": {
-      "version": "0.2.0",
-      "resolved": "http://registry.npmjs.org/callsites/-/callsites-0.2.0.tgz",
-      "integrity": "sha1-r6uWJikQp/M8GaV3WCXGnzTjUMo=",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
+      "integrity": "sha512-P8BjAsXvZS+VIDUI11hHCQEv74YT67YUi5JJFNWIqL235sBmjX4+qx9Muvls5ivyNENctx46xQLQ3aTuE7ssaQ==",
       "dev": true,
       "engines": {
-        "node": ">=0.10.0"
+        "node": ">=6"
       }
     },
     "node_modules/chalk": {
-      "version": "2.4.1",
-      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.1.tgz",
-      "integrity": "sha512-ObN6h1v2fTJSmUXoS3nMQ92LbDK9be4TV+6G+omQlGJFdcUX5heKi1LZ1YnRMIgwTLEj3E24bT6tYni50rlCfQ==",
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+      "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
       "dev": true,
       "dependencies": {
         "ansi-styles": "^3.2.1",
@@ -508,13 +500,6 @@
       "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
       "dev": true
     },
-    "node_modules/circular-json": {
-      "version": "0.3.3",
-      "resolved": "https://registry.npmjs.org/circular-json/-/circular-json-0.3.3.tgz",
-      "integrity": "sha512-UZK3NBx2Mca+b5LsG7bY183pHWt5Y1xts4P3Pz7ENTwGVnJOUWbRb3ocjvX7hx9tq/yTAdclXm9sZ38gNuem4A==",
-      "deprecated": "CircularJSON is in maintenance only, flatted is its successor.",
-      "dev": true
-    },
     "node_modules/class-utils": {
       "version": "0.3.6",
       "resolved": "https://registry.npmjs.org/class-utils/-/class-utils-0.3.6.tgz",
@@ -545,7 +530,7 @@
     "node_modules/cli-cursor": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-2.1.0.tgz",
-      "integrity": "sha1-s12sN2R5+sw+lHR9QdDQ9SOP/LU=",
+      "integrity": "sha512-8lgKz8LmCRYZZQDpRyT2m5rKJ08TnU4tR9FFFW2rxpxR1FzWi4PQ/NfyODchAatHaUgnSPVcx/R5w6NuTBzFiw==",
       "dev": true,
       "dependencies": {
         "restore-cursor": "^2.0.0"
@@ -555,9 +540,9 @@
       }
     },
     "node_modules/cli-width": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.0.tgz",
-      "integrity": "sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk=",
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.1.tgz",
+      "integrity": "sha512-GRMWDxpOB6Dgk2E5Uo+3eEBvtOOlimMmpbFiKuLFnQzYDavtLFY3K5ona41jgN/WdRZtG7utuVSVTL4HbZHGkw==",
       "dev": true
     },
     "node_modules/clone": {
@@ -879,15 +864,15 @@
       }
     },
     "node_modules/doctrine": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-2.1.0.tgz",
-      "integrity": "sha512-35mSku4ZXK0vfCuHEDAwt55dg2jNajHZ1odvF+8SSr82EsZY4QmXfuWso8oEd8zRhVObSN18aM0CjSdoBX7zIw==",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-3.0.0.tgz",
+      "integrity": "sha512-yS+Q5i3hBf7GBkd4KG8a7eBNNWNGLTaEwwYWUijIYM7zrlYDM0BFXHjjPWlWZ1Rg7UaddZeIDmi9jF3HmqiQ2w==",
       "dev": true,
       "dependencies": {
         "esutils": "^2.0.2"
       },
       "engines": {
-        "node": ">=0.10.0"
+        "node": ">=6.0.0"
       }
     },
     "node_modules/duplexer2": {
@@ -899,6 +884,12 @@
         "readable-stream": "~1.1.9"
       }
     },
+    "node_modules/emoji-regex": {
+      "version": "7.0.3",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
+      "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
+      "dev": true
+    },
     "node_modules/end-of-stream": {
       "version": "0.1.5",
       "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-0.1.5.tgz",
@@ -971,47 +962,46 @@
       }
     },
     "node_modules/eslint": {
-      "version": "5.10.0",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-5.10.0.tgz",
-      "integrity": "sha512-HpqzC+BHULKlnPwWae9MaVZ5AXJKpkxCVXQHrFaRw3hbDj26V/9ArYM4Rr/SQ8pi6qUPLXSSXC4RBJlyq2Z2OQ==",
+      "version": "5.16.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-5.16.0.tgz",
+      "integrity": "sha512-S3Rz11i7c8AA5JPv7xAH+dOyq/Cu/VXHiHXBPOU1k/JAM5dXqQPt3qcrhpHSorXmrpu2g0gkIBVXAqCpzfoZIg==",
       "dev": true,
       "dependencies": {
         "@babel/code-frame": "^7.0.0",
-        "ajv": "^6.5.3",
+        "ajv": "^6.9.1",
         "chalk": "^2.1.0",
         "cross-spawn": "^6.0.5",
         "debug": "^4.0.1",
-        "doctrine": "^2.1.0",
-        "eslint-scope": "^4.0.0",
+        "doctrine": "^3.0.0",
+        "eslint-scope": "^4.0.3",
         "eslint-utils": "^1.3.1",
         "eslint-visitor-keys": "^1.0.0",
-        "espree": "^5.0.0",
+        "espree": "^5.0.1",
         "esquery": "^1.0.1",
         "esutils": "^2.0.2",
-        "file-entry-cache": "^2.0.0",
+        "file-entry-cache": "^5.0.1",
         "functional-red-black-tree": "^1.0.1",
         "glob": "^7.1.2",
         "globals": "^11.7.0",
         "ignore": "^4.0.6",
+        "import-fresh": "^3.0.0",
         "imurmurhash": "^0.1.4",
-        "inquirer": "^6.1.0",
-        "js-yaml": "^3.12.0",
+        "inquirer": "^6.2.2",
+        "js-yaml": "^3.13.0",
         "json-stable-stringify-without-jsonify": "^1.0.1",
         "levn": "^0.3.0",
-        "lodash": "^4.17.5",
+        "lodash": "^4.17.11",
         "minimatch": "^3.0.4",
         "mkdirp": "^0.5.1",
         "natural-compare": "^1.4.0",
         "optionator": "^0.8.2",
         "path-is-inside": "^1.0.2",
-        "pluralize": "^7.0.0",
         "progress": "^2.0.0",
         "regexpp": "^2.0.1",
-        "require-uncached": "^1.0.3",
         "semver": "^5.5.1",
         "strip-ansi": "^4.0.0",
         "strip-json-comments": "^2.0.1",
-        "table": "^5.0.2",
+        "table": "^5.2.3",
         "text-table": "^0.2.0"
       },
       "bin": {
@@ -1022,9 +1012,9 @@
       }
     },
     "node_modules/eslint-scope": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-4.0.0.tgz",
-      "integrity": "sha512-1G6UTDi7Jc1ELFwnR58HV4fK9OQK4S6N985f166xqXxpjU6plxFISJa2Ba9KCQuFa8RCnj/lSFJbHo7UFDBnUA==",
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-4.0.3.tgz",
+      "integrity": "sha512-p7VutNr1O/QrxysMo3E45FjYDTeXBy0iTltPFNSqKAIfjDSXC+4dj+qfyuD8bfAXrW/y6lW3O76VaYNPKfpKrg==",
       "dev": true,
       "dependencies": {
         "esrecurse": "^4.1.0",
@@ -1044,21 +1034,21 @@
       }
     },
     "node_modules/eslint-visitor-keys": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz",
-      "integrity": "sha512-qzm/XxIbxm/FHyH341ZrbnMUpe+5Bocte9xkmFMzPMjRaZMcXww+MpBptFvtU+79L362nqiLhekCxCxDPaUMBQ==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-1.3.0.tgz",
+      "integrity": "sha512-6J72N8UNa462wa/KFODt/PJ3IU60SDpC3QXC1Hjc1BXXpfL2C9R5+AU7jhe0F6GREqVMh4Juu+NY7xn+6dipUQ==",
       "dev": true,
       "engines": {
         "node": ">=4"
       }
     },
     "node_modules/espree": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/espree/-/espree-5.0.0.tgz",
-      "integrity": "sha512-1MpUfwsdS9MMoN7ZXqAr9e9UKdVHDcvrJpyx7mm1WuQlx/ygErEQBzgi5Nh5qBHIoYweprhtMkTCb9GhcAIcsA==",
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/espree/-/espree-5.0.1.tgz",
+      "integrity": "sha512-qWAZcWh4XE/RwzLJejfcofscgMc9CamR6Tn1+XRXNzrvUSSbiAjGOI/fggztjIi7y9VLPqnICMIPiGyr8JaZ0A==",
       "dev": true,
       "dependencies": {
-        "acorn": "^6.0.2",
+        "acorn": "^6.0.7",
         "acorn-jsx": "^5.0.0",
         "eslint-visitor-keys": "^1.0.0"
       },
@@ -1092,17 +1082,26 @@
       }
     },
     "node_modules/esrecurse": {
-      "version": "4.2.1",
-      "resolved": "https://registry.npmjs.org/esrecurse/-/esrecurse-4.2.1.tgz",
-      "integrity": "sha512-64RBB++fIOAXPw3P9cy89qfMlvZEXZkqqJkjqqXIvzP5ezRZjW+lPWjw35UX/3EhUPFYbg5ER4JYgDw4007/DQ==",
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/esrecurse/-/esrecurse-4.3.0.tgz",
+      "integrity": "sha512-KmfKL3b6G+RXvP8N1vr3Tq1kL/oCFgn2NYXEtqP8/L3pKapUA4G8cFVaoF3SU323CD4XypR/ffioHmkti6/Tag==",
       "dev": true,
       "dependencies": {
-        "estraverse": "^4.1.0"
+        "estraverse": "^5.2.0"
       },
       "engines": {
         "node": ">=4.0"
       }
     },
+    "node_modules/esrecurse/node_modules/estraverse": {
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-5.3.0.tgz",
+      "integrity": "sha512-MMdARuVEQziNTeJD8DgMqmhwR11BRQ/cBP+pLtYdSTnf3MIO8fFeiINEbX36ZdNlfU/7A9f3gUw49B3oQsvwBA==",
+      "dev": true,
+      "engines": {
+        "node": ">=4.0"
+      }
+    },
     "node_modules/estraverse": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-4.2.0.tgz",
@@ -1250,9 +1249,9 @@
       }
     },
     "node_modules/external-editor": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/external-editor/-/external-editor-3.0.3.tgz",
-      "integrity": "sha512-bn71H9+qWoOQKyZDo25mOMVpSmXROAsTJVVVYzrrtol3d4y+AsKjf4Iwl2Q+IuT0kFSQ1qo166UuIwqYq7mGnA==",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/external-editor/-/external-editor-3.1.0.tgz",
+      "integrity": "sha512-hMQ4CX1p1izmuLYyZqLMO/qGNw10wSv9QDCPfzXfyFrOaCSSoRfqE1Kf1s5an66J5JZC62NewG+mK49jOCtQew==",
       "dev": true,
       "dependencies": {
         "chardet": "^0.7.0",
@@ -1360,15 +1359,15 @@
       }
     },
     "node_modules/fast-deep-equal": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-2.0.1.tgz",
-      "integrity": "sha1-ewUhjd+WZ79/Nwv3/bLLFf3Qqkk=",
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz",
+      "integrity": "sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q==",
       "dev": true
     },
     "node_modules/fast-json-stable-stringify": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/fast-json-stable-stringify/-/fast-json-stable-stringify-2.0.0.tgz",
-      "integrity": "sha1-1RQsDK7msRifh9OnYREGT4bIu/I=",
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/fast-json-stable-stringify/-/fast-json-stable-stringify-2.1.0.tgz",
+      "integrity": "sha512-lhd/wF+Lk98HZoTCtlVraHtfh5XYijIjalXck7saUtuanSDyLMxnHhSXEDJqHxD7msR8D0uCmqlkwjCV8xvwHw==",
       "dev": true
     },
     "node_modules/fast-levenshtein": {
@@ -1380,7 +1379,7 @@
     "node_modules/figures": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/figures/-/figures-2.0.0.tgz",
-      "integrity": "sha1-OrGi0qYsi/tDGgyUy3l6L84nyWI=",
+      "integrity": "sha512-Oa2M9atig69ZkfwiApY8F2Yy+tzMbazyvqv21R0NsSC8floSOC09BbT1ITWAdoMGQvJ/aZnR1KMwdx9tvHnTNA==",
       "dev": true,
       "dependencies": {
         "escape-string-regexp": "^1.0.5"
@@ -1390,16 +1389,15 @@
       }
     },
     "node_modules/file-entry-cache": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/file-entry-cache/-/file-entry-cache-2.0.0.tgz",
-      "integrity": "sha1-w5KZDD5oR4PYOLjISkXYoEhFg2E=",
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/file-entry-cache/-/file-entry-cache-5.0.1.tgz",
+      "integrity": "sha512-bCg29ictuBaKUwwArK4ouCaqDgLZcysCFLmM/Yn/FDoqndh/9vNuQfXRDvTuXKLxfD/JtZQGKFT8MGcJBK644g==",
       "dev": true,
       "dependencies": {
-        "flat-cache": "^1.2.1",
-        "object-assign": "^4.0.1"
+        "flat-cache": "^2.0.1"
       },
       "engines": {
-        "node": ">=0.10.0"
+        "node": ">=4"
       }
     },
     "node_modules/fill-range": {
@@ -1485,20 +1483,25 @@
       }
     },
     "node_modules/flat-cache": {
-      "version": "1.3.4",
-      "resolved": "https://registry.npmjs.org/flat-cache/-/flat-cache-1.3.4.tgz",
-      "integrity": "sha512-VwyB3Lkgacfik2vhqR4uv2rvebqmDvFu4jlN/C1RzWoJEo8I7z4Q404oiqYCkq41mni8EzQnm95emU9seckwtg==",
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/flat-cache/-/flat-cache-2.0.1.tgz",
+      "integrity": "sha512-LoQe6yDuUMDzQAEH8sgmh4Md6oZnc/7PjtwjNFSzveXqSHt6ka9fPBuso7IGf9Rz4uqnSnWiFH2B/zj24a5ReA==",
       "dev": true,
       "dependencies": {
-        "circular-json": "^0.3.1",
-        "graceful-fs": "^4.1.2",
-        "rimraf": "~2.6.2",
-        "write": "^0.2.1"
+        "flatted": "^2.0.0",
+        "rimraf": "2.6.3",
+        "write": "1.0.3"
       },
       "engines": {
-        "node": ">=0.10.0"
+        "node": ">=4"
       }
     },
+    "node_modules/flatted": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/flatted/-/flatted-2.0.2.tgz",
+      "integrity": "sha512-r5wGx7YeOwNWNlCA0wQ86zKyDLMQr+/RB8xy74M4hTphfmjlijTSSXGuH8rnvKZnfT9i+75zmd8jcKdMR4O6jA==",
+      "dev": true
+    },
     "node_modules/for-in": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/for-in/-/for-in-1.0.2.tgz",
@@ -1575,20 +1578,23 @@
       }
     },
     "node_modules/glob": {
-      "version": "7.1.3",
-      "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.3.tgz",
-      "integrity": "sha512-vcfuiIxogLV4DlGBHIUOwI0IbrJ8HWPc4MU7HzviGeNho/UJDfi6B5p3sHeWIQ0KGIU0Jpxi5ZHxemQfLkkAwQ==",
+      "version": "7.2.3",
+      "resolved": "https://registry.npmjs.org/glob/-/glob-7.2.3.tgz",
+      "integrity": "sha512-nFR0zLpU2YCaRxwoCJvL6UvCH2JFyFVIvwTLsIf21AuHlMskA1hhTdk+LlYJtOlYt9v6dvszD2BGRqBL+iQK9Q==",
       "dev": true,
       "dependencies": {
         "fs.realpath": "^1.0.0",
         "inflight": "^1.0.4",
         "inherits": "2",
-        "minimatch": "^3.0.4",
+        "minimatch": "^3.1.1",
         "once": "^1.3.0",
         "path-is-absolute": "^1.0.0"
       },
       "engines": {
         "node": "*"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
       }
     },
     "node_modules/glob-stream": {
@@ -1670,6 +1676,18 @@
         "node": ">= 0.9"
       }
     },
+    "node_modules/glob/node_modules/minimatch": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
+      "integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
+      "dev": true,
+      "dependencies": {
+        "brace-expansion": "^1.1.7"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/glob2base": {
       "version": "0.0.12",
       "resolved": "https://registry.npmjs.org/glob2base/-/glob2base-0.0.12.tgz",
@@ -2322,6 +2340,22 @@
         "node": ">= 4"
       }
     },
+    "node_modules/import-fresh": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.3.0.tgz",
+      "integrity": "sha512-veYYhQa+D1QBKznvhUHxb8faxlrwUnxseDAbAp457E0wLNio2bOSKnjYDhMj+YiAq61xrMGhQk9iXVk5FzgQMw==",
+      "dev": true,
+      "dependencies": {
+        "parent-module": "^1.0.0",
+        "resolve-from": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/imurmurhash": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/imurmurhash/-/imurmurhash-0.1.4.tgz",
@@ -2358,23 +2392,23 @@
       }
     },
     "node_modules/inquirer": {
-      "version": "6.2.1",
-      "resolved": "https://registry.npmjs.org/inquirer/-/inquirer-6.2.1.tgz",
-      "integrity": "sha512-088kl3DRT2dLU5riVMKKr1DlImd6X7smDhpXUCkJDCKvTEJeRiXh0G132HG9u5a+6Ylw9plFRY7RuTnwohYSpg==",
+      "version": "6.5.2",
+      "resolved": "https://registry.npmjs.org/inquirer/-/inquirer-6.5.2.tgz",
+      "integrity": "sha512-cntlB5ghuB0iuO65Ovoi8ogLHiWGs/5yNrtUcKjFhSSiVeAIVpD7koaSU9RM8mpXw5YDi9RdYXGQMaOURB7ycQ==",
       "dev": true,
       "dependencies": {
-        "ansi-escapes": "^3.0.0",
-        "chalk": "^2.0.0",
+        "ansi-escapes": "^3.2.0",
+        "chalk": "^2.4.2",
         "cli-cursor": "^2.1.0",
         "cli-width": "^2.0.0",
-        "external-editor": "^3.0.0",
+        "external-editor": "^3.0.3",
         "figures": "^2.0.0",
-        "lodash": "^4.17.10",
+        "lodash": "^4.17.12",
         "mute-stream": "0.0.7",
         "run-async": "^2.2.0",
-        "rxjs": "^6.1.0",
+        "rxjs": "^6.4.0",
         "string-width": "^2.1.0",
-        "strip-ansi": "^5.0.0",
+        "strip-ansi": "^5.1.0",
         "through": "^2.3.6"
       },
       "engines": {
@@ -2382,21 +2416,21 @@
       }
     },
     "node_modules/inquirer/node_modules/ansi-regex": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.0.0.tgz",
-      "integrity": "sha512-iB5Dda8t/UqpPI/IjsejXu5jOGDrzn41wJyljwPH65VCIbk6+1BzFIMJGFwTNrYXT1CrD+B4l19U7awiQ8rk7w==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.1.tgz",
+      "integrity": "sha512-ILlv4k/3f6vfQ4OoP2AGvirOktlQ98ZEL1k9FaQjxa3L1abBgbuTDAdPOpvbGncC0BTVQrl+OM8xZGK6tWXt7g==",
       "dev": true,
       "engines": {
         "node": ">=6"
       }
     },
     "node_modules/inquirer/node_modules/strip-ansi": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.0.0.tgz",
-      "integrity": "sha512-Uu7gQyZI7J7gn5qLn1Np3G9vcYGTVqB+lFTytnDJv83dd8T22aGH451P3jueT2/QemInJDfxHB5Tde5OzgG1Ow==",
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+      "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
       "dev": true,
       "dependencies": {
-        "ansi-regex": "^4.0.0"
+        "ansi-regex": "^4.1.0"
       },
       "engines": {
         "node": ">=6"
@@ -2519,7 +2553,7 @@
     "node_modules/is-fullwidth-code-point": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
-      "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
+      "integrity": "sha512-VHskAKYM8RfSFXwee5t5cbN5PZeq1Wrh6qd5bkyiXIf6UQcN6w/A0eXM9r6t8d+GYOh+o6ZhiEnb88LN/Y8m2w==",
       "dev": true,
       "engines": {
         "node": ">=4"
@@ -2655,9 +2689,9 @@
       "dev": true
     },
     "node_modules/js-yaml": {
-      "version": "3.12.0",
-      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.12.0.tgz",
-      "integrity": "sha512-PIt2cnwmPfL4hKNwqeiuz4bKfnzHTBv6HyVgjahA6mPLwPDzjDWrplJBMjHUFxku/N3FlmrbyPclad+I+4mJ3A==",
+      "version": "3.14.1",
+      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.14.1.tgz",
+      "integrity": "sha512-okMH7OXXJ7YrN9Ok3/SXrnu4iX9yOk+25nqX4imS2npuvTYDmo/QEZoqwZkYaIDk3jVvBOTOIEgEhaLOynBS9g==",
       "dev": true,
       "dependencies": {
         "argparse": "^1.0.7",
@@ -2721,9 +2755,9 @@
       }
     },
     "node_modules/lodash": {
-      "version": "4.17.11",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.11.tgz",
-      "integrity": "sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg==",
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==",
       "dev": true
     },
     "node_modules/lodash._basecopy": {
@@ -3102,7 +3136,7 @@
     "node_modules/mute-stream": {
       "version": "0.0.7",
       "resolved": "https://registry.npmjs.org/mute-stream/-/mute-stream-0.0.7.tgz",
-      "integrity": "sha1-MHXOk7whuPq0PhvE2n6BFe0ee6s=",
+      "integrity": "sha512-r65nCZhrbXXb6dXOACihYApHw2Q6pV0M3V0PSxd74N0+D8nzAdEAITq2oAjA1jVnKI+tGvEBUpqiMh0+rW6zDQ==",
       "dev": true
     },
     "node_modules/nanomatch": {
@@ -3280,7 +3314,7 @@
     "node_modules/onetime": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/onetime/-/onetime-2.0.1.tgz",
-      "integrity": "sha1-BnQoIw/WdEOyeUsiu6UotoZ5YtQ=",
+      "integrity": "sha512-oyyPpiMaKARvvcgip+JV+7zci5L8D1W9RZIz2l1o08AM3pfspitVWnPt3mzHcBPp12oYMTy0pqrFs/C+m3EwsQ==",
       "dev": true,
       "dependencies": {
         "mimic-fn": "^1.0.0"
@@ -3334,8 +3368,8 @@
     },
     "node_modules/os-tmpdir": {
       "version": "1.0.2",
-      "resolved": "http://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz",
-      "integrity": "sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ=",
+      "resolved": "https://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz",
+      "integrity": "sha512-D2FR03Vir7FIu45XBY20mTb+/ZSWB00sjU9jdQXt83gDrI4Ztz5Fs7/yy74g2N5SVQY4xY1qDr4rNddwYRVX0g==",
       "dev": true,
       "engines": {
         "node": ">=0.10.0"
@@ -3350,6 +3384,18 @@
         "node": ">=4"
       }
     },
+    "node_modules/parent-module": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/parent-module/-/parent-module-1.0.1.tgz",
+      "integrity": "sha512-GQ2EWRpQV8/o+Aw8YqtfZZPfNRWZYkbidE9k5rpl/hC3vtHHBfGm2Ifi6qWV+coDGkrUKZAxE3Lot5kcsRlh+g==",
+      "dev": true,
+      "dependencies": {
+        "callsites": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/parse-filepath": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/parse-filepath/-/parse-filepath-1.0.2.tgz",
@@ -3463,15 +3509,6 @@
         "node": ">= 0.10"
       }
     },
-    "node_modules/pluralize": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/pluralize/-/pluralize-7.0.0.tgz",
-      "integrity": "sha512-ARhBOdzS3e41FbkW/XWrTEtukqqLoK5+Z/4UeDaLuSW+39JPeFgs4gCGqsrJHVZX0fUrx//4OF0K1CUGwlIFow==",
-      "dev": true,
-      "engines": {
-        "node": ">=4"
-      }
-    },
     "node_modules/posix-character-classes": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/posix-character-classes/-/posix-character-classes-0.1.1.tgz",
@@ -3515,9 +3552,9 @@
       }
     },
     "node_modules/punycode": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.1.1.tgz",
-      "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==",
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.1.tgz",
+      "integrity": "sha512-vYt7UD1U9Wg6138shLtLOvdAu+8DsC/ilFtEVHcH+wydcSpNE20AfSOduf6MkRFahL5FY7X1oU7nKVZFtfq8Fg==",
       "dev": true,
       "engines": {
         "node": ">=6"
@@ -3612,19 +3649,6 @@
         "node": ">= 0.4"
       }
     },
-    "node_modules/require-uncached": {
-      "version": "1.0.3",
-      "resolved": "http://registry.npmjs.org/require-uncached/-/require-uncached-1.0.3.tgz",
-      "integrity": "sha1-Tg1W1slmL9MeQwEcS5WqSZVUIdM=",
-      "dev": true,
-      "dependencies": {
-        "caller-path": "^0.1.0",
-        "resolve-from": "^1.0.0"
-      },
-      "engines": {
-        "node": ">=0.10.0"
-      }
-    },
     "node_modules/resolve": {
       "version": "1.8.1",
       "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.8.1.tgz",
@@ -3648,12 +3672,12 @@
       }
     },
     "node_modules/resolve-from": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-1.0.1.tgz",
-      "integrity": "sha1-Jsv+k10a7uq7Kbw/5a6wHpPUQiY=",
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-4.0.0.tgz",
+      "integrity": "sha512-pb/MYmXstAkysRFx8piNI1tGFNQIFA3vkE3Gq4EuA1dF6gHp/+vgZqsCGJapvy8N3Q+4o7FwvquPJcnZ7RYy4g==",
       "dev": true,
       "engines": {
-        "node": ">=0.10.0"
+        "node": ">=4"
       }
     },
     "node_modules/resolve-url": {
@@ -3666,7 +3690,7 @@
     "node_modules/restore-cursor": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/restore-cursor/-/restore-cursor-2.0.0.tgz",
-      "integrity": "sha1-n37ih/gv0ybU/RYpI9YhKe7g368=",
+      "integrity": "sha512-6IzJLuGi4+R14vwagDHX+JrXmPVtPpn4mffDJ1UdR7/Edm87fl6yi8mMBIVvFtJaNTUvjughmW4hwLhRG7gC1Q==",
       "dev": true,
       "dependencies": {
         "onetime": "^2.0.0",
@@ -3686,33 +3710,30 @@
       }
     },
     "node_modules/rimraf": {
-      "version": "2.6.2",
-      "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.6.2.tgz",
-      "integrity": "sha512-lreewLK/BlghmxtfH36YYVg1i8IAce4TI7oao75I1g245+6BctqTVQiBP3YUJ9C6DQOXJmkYR9X9fCLtCOJc5w==",
+      "version": "2.6.3",
+      "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.6.3.tgz",
+      "integrity": "sha512-mwqeW5XsA2qAejG46gYdENaxXjx9onRNCfn7L0duuP4hCuTIi/QO7PDK07KJfp1d+izWPrzEJDcSqBa0OZQriA==",
       "dev": true,
       "dependencies": {
-        "glob": "^7.0.5"
+        "glob": "^7.1.3"
       },
       "bin": {
         "rimraf": "bin.js"
       }
     },
     "node_modules/run-async": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/run-async/-/run-async-2.3.0.tgz",
-      "integrity": "sha1-A3GrSuC91yDUFm19/aZP96RFpsA=",
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/run-async/-/run-async-2.4.1.tgz",
+      "integrity": "sha512-tvVnVv01b8c1RrA6Ep7JkStj85Guv/YrMcwqYQnwjsAS2cTmmPGBBjAjpCW7RrSodNSoE2/qg9O4bceNvUuDgQ==",
       "dev": true,
-      "dependencies": {
-        "is-promise": "^2.1.0"
-      },
       "engines": {
         "node": ">=0.12.0"
       }
     },
     "node_modules/rxjs": {
-      "version": "6.3.3",
-      "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-6.3.3.tgz",
-      "integrity": "sha512-JTWmoY9tWCs7zvIk/CvRjhjGaOd+OVBM987mxFo+OW66cGpdKjZcpmc74ES1sB//7Kl/PAe8+wEakuhG4pcgOw==",
+      "version": "6.6.7",
+      "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-6.6.7.tgz",
+      "integrity": "sha512-hTdwr+7yYNIT5n4AMYp85KA6yw2Va0FLa3Rguvbpa4W3I5xynaBZo41cM3XM+4Q6fRMj3sBYIR1VAmZMXYJvRQ==",
       "dev": true,
       "dependencies": {
         "tslib": "^1.9.0"
@@ -3822,9 +3843,9 @@
       "dev": true
     },
     "node_modules/slice-ansi": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-2.0.0.tgz",
-      "integrity": "sha512-4j2WTWjp3GsZ+AOagyzVbzp4vWGtZ0hEZ/gDY/uTvm6MTxUfTUIsnMIFb1bn8o0RuXiqUw15H1bue8f22Vw2oQ==",
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-2.1.0.tgz",
+      "integrity": "sha512-Qu+VC3EwYLldKa1fCxuuvULvSJOKEgk9pi8dZeCVK7TqBfUNTH4sFkk4joj8afVSfAYgJoSOetjx9QWOJ5mYoQ==",
       "dev": true,
       "dependencies": {
         "ansi-styles": "^3.2.0",
@@ -4035,7 +4056,7 @@
     "node_modules/sprintf-js": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
-      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
+      "integrity": "sha512-D9cPgkvLlV3t3IzL0D0YLvGA9Ahk4PcvVwUbN0dSGr1aP0Nrt4AEnTUbuGvquEC0mA64Gqt1fzirlRs5ibXx8g==",
       "dev": true
     },
     "node_modules/static-extend": {
@@ -4091,7 +4112,7 @@
     "node_modules/strip-ansi": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
-      "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+      "integrity": "sha512-4XaJ2zQdCzROZDivEVIDPkcQn8LMFSa8kj8Gxb/Lnwzv9A8VctNZ+lfivC/sV3ivW8ElJTERXZoPBRrZKkNKow==",
       "dev": true,
       "dependencies": {
         "ansi-regex": "^3.0.0"
@@ -4156,20 +4177,55 @@
       }
     },
     "node_modules/table": {
-      "version": "5.1.1",
-      "resolved": "https://registry.npmjs.org/table/-/table-5.1.1.tgz",
-      "integrity": "sha512-NUjapYb/qd4PeFW03HnAuOJ7OMcBkJlqeClWxeNlQ0lXGSb52oZXGzkO0/I0ARegQ2eUT1g2VDJH0eUxDRcHmw==",
+      "version": "5.4.6",
+      "resolved": "https://registry.npmjs.org/table/-/table-5.4.6.tgz",
+      "integrity": "sha512-wmEc8m4fjnob4gt5riFRtTu/6+4rSe12TpAELNSqHMfF3IqnA+CH37USM6/YR3qRZv7e56kAEAtd6nKZaxe0Ug==",
       "dev": true,
       "dependencies": {
-        "ajv": "^6.6.1",
-        "lodash": "^4.17.11",
-        "slice-ansi": "2.0.0",
-        "string-width": "^2.1.1"
+        "ajv": "^6.10.2",
+        "lodash": "^4.17.14",
+        "slice-ansi": "^2.1.0",
+        "string-width": "^3.0.0"
       },
       "engines": {
         "node": ">=6.0.0"
       }
     },
+    "node_modules/table/node_modules/ansi-regex": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.1.tgz",
+      "integrity": "sha512-ILlv4k/3f6vfQ4OoP2AGvirOktlQ98ZEL1k9FaQjxa3L1abBgbuTDAdPOpvbGncC0BTVQrl+OM8xZGK6tWXt7g==",
+      "dev": true,
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/table/node_modules/string-width": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+      "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+      "dev": true,
+      "dependencies": {
+        "emoji-regex": "^7.0.1",
+        "is-fullwidth-code-point": "^2.0.0",
+        "strip-ansi": "^5.1.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/table/node_modules/strip-ansi": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+      "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+      "dev": true,
+      "dependencies": {
+        "ansi-regex": "^4.1.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/text-table": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
@@ -4178,8 +4234,8 @@
     },
     "node_modules/through": {
       "version": "2.3.8",
-      "resolved": "http://registry.npmjs.org/through/-/through-2.3.8.tgz",
-      "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "integrity": "sha512-w89qg7PI8wAdvX60bMDP+bFoD5Dvhm9oLheFp5O4a2QF0cSBGsBX4qZmadPMvVqlLJBBci+WqGGOAPvcDeNSVg==",
       "dev": true
     },
     "node_modules/through2": {
@@ -4318,9 +4374,9 @@
       }
     },
     "node_modules/tslib": {
-      "version": "1.9.3",
-      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.9.3.tgz",
-      "integrity": "sha512-4krF8scpejhaOgqzBEcGM7yDIEfi0/8+8zDRZhNZZ2kjmHJ4hv3zCbQWxoJGz1iw5U0Jl0nma13xzHXcncMavQ==",
+      "version": "1.14.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
+      "integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==",
       "dev": true
     },
     "node_modules/type-check": {
@@ -4479,9 +4535,9 @@
       "dev": true
     },
     "node_modules/uri-js": {
-      "version": "4.2.2",
-      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
-      "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
+      "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
       "dev": true,
       "dependencies": {
         "punycode": "^2.1.0"
@@ -4644,15 +4700,15 @@
       "dev": true
     },
     "node_modules/write": {
-      "version": "0.2.1",
-      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
-      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
       "dev": true,
       "dependencies": {
         "mkdirp": "^0.5.1"
       },
       "engines": {
-        "node": ">=0.10.0"
+        "node": ">=4"
       }
     },
     "node_modules/xtend": {
diff --git a/package.json b/package.json
index 1d3dcf3..a2ef101 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
   "readmeFilename": "README.md",
   "devDependencies": {
     "benchmark": "^2.1.4",
-    "eslint": "^5.10.0",
+    "eslint": "^5.16.0",
     "gulp": "^3.9.1",
     "gulp-benchmark": "^1.1.1",
     "gulp-eslint": "^5.0.0",
diff --git a/src/sprintf.js b/src/sprintf.js
index 65d6324..023d107 100644
--- a/src/sprintf.js
+++ b/src/sprintf.js
@@ -2,7 +2,7 @@
 
 !function() {
     'use strict'
-
+    
     var re = {
         not_string: /[^s]/,
         not_bool: /[^t]/,
@@ -20,16 +20,16 @@
         index_access: /^\[(\d+)\]/,
         sign: /^[+-]/
     }
-
+    
     function sprintf(key) {
         // `arguments` is not an array, but should be fine for this call
         return sprintf_format(sprintf_parse(key), arguments)
     }
-
+    
     function vsprintf(fmt, argv) {
         return sprintf.apply(null, [fmt].concat(argv || []))
     }
-
+    
     function sprintf_format(parse_tree, argv) {
         var cursor = 1, tree_length = parse_tree.length, arg, output = '', i, k, ph, pad, pad_character, pad_length, is_positive, sign
         for (i = 0; i < tree_length; i++) {
@@ -53,19 +53,19 @@
                 else { // positional argument (implicit)
                     arg = argv[cursor++]
                 }
-
+                
                 if (re.not_type.test(ph.type) && re.not_primitive.test(ph.type) && arg instanceof Function) {
                     arg = arg()
                 }
-
+                
                 if (re.numeric_arg.test(ph.type) && (typeof arg !== 'number' && isNaN(arg))) {
                     throw new TypeError(sprintf('[sprintf] expecting number but found %T', arg))
                 }
-
+                
                 if (re.number.test(ph.type)) {
-                    is_positive = arg >= 0
+                    is_positive = arg >= 0 || isNaN(arg)
                 }
-
+                
                 switch (ph.type) {
                     case 'b':
                         arg = parseInt(arg, 10).toString(2)
@@ -138,14 +138,14 @@
         }
         return output
     }
-
+    
     var sprintf_cache = Object.create(null)
-
+    
     function sprintf_parse(fmt) {
         if (sprintf_cache[fmt]) {
             return sprintf_cache[fmt]
         }
-
+        
         var _fmt = fmt, match, parse_tree = [], arg_names = 0
         while (_fmt) {
             if ((match = re.text.exec(_fmt)) !== null) {
@@ -183,7 +183,7 @@
                 if (arg_names === 3) {
                     throw new Error('[sprintf] mixing positional and named placeholders is not (yet) supported')
                 }
-
+                
                 parse_tree.push(
                     {
                         placeholder: match[0],
@@ -205,27 +205,61 @@
         }
         return sprintf_cache[fmt] = parse_tree
     }
-
+    
+    // tagged template string version
+    // original function reference, adapted to use sprintf
+    // https://ghost-together.medium.com/tagged-template-literals-1e1f175c21e4
+    function SPF(strings, ...values) {
+        var result = ``
+        
+        strings.map((string, index) => {
+            var match
+            
+            var value = (index <= values.length - 1) ? values[index] : ``
+            
+            // look ahead for a format for the current value
+            match = re.placeholder.exec(strings[index+1])
+            
+            if ( match ) {
+                value = sprintf(match[0], value ? value : NaN)
+            }
+            
+            // clean up format on current string
+            // (was used to format previous value)
+            match = re.placeholder.exec(string)
+            
+            if ( match ) {
+                string = string.slice(match[0].length)
+            }
+            
+            result += string + value
+        })
+        return result
+    }
+    
     /**
-     * export to either browser or node.js
-     */
+    * export to either browser or node.js
+    */
     /* eslint-disable quote-props */
     if (typeof exports !== 'undefined') {
         exports['sprintf'] = sprintf
         exports['vsprintf'] = vsprintf
+        exports['SPF'] = SPF
     }
     if (typeof window !== 'undefined') {
         window['sprintf'] = sprintf
         window['vsprintf'] = vsprintf
-
+        window['SPF'] = SPF
         if (typeof define === 'function' && define['amd']) {
             define(function() {
                 return {
                     'sprintf': sprintf,
-                    'vsprintf': vsprintf
+                    'vsprintf': vsprintf,
+                    'SPF': SPF
                 }
             })
         }
     }
+    
     /* eslint-enable quote-props */
 }(); // eslint-disable-line
diff --git a/test/test.js b/test/test.js
index 9588da6..3ab3b78 100644
--- a/test/test.js
+++ b/test/test.js
@@ -4,8 +4,9 @@
 
 var assert = require('assert'),
     sprintfjs = require('../src/sprintf.js'),
-    sprintf = sprintfjs.sprintf
-
+    sprintf = sprintfjs.sprintf,
+    SPF = sprintfjs.SPF
+    
 describe('sprintfjs', function() {
     var pi = 3.141592653589793
 
@@ -103,10 +104,14 @@ describe('sprintfjs', function() {
         assert.equal('2.3', sprintf('%.1f', 2.345))
         assert.equal('xxxxx', sprintf('%5.5s', 'xxxxxx'))
         assert.equal('    x', sprintf('%5.1s', 'xxxxxx'))
-
     })
-
+    
     it('should return formated strings for callbacks', function() {
         assert.equal('foobar', sprintf('%s', function() { return 'foobar' }))
     })
+
+    it('should return formatted strings for tagged template literals', function() {
+        assert.equal('2.3', SPF`${2.345}%.1f`)
+        assert.equal('______-123', SPF`${-123}%+'_10d`)
+    })
 })