chore(package): update @types/react to version 16.8.12

Closes #63

Author: greenkeeper[bot]

package.json

@@ -21,7 +21,7 @@
   },
   "devDependencies": {
     "@types/jest": "^23.3.0",
-    "@types/react": "~16.7.0",
+    "@types/react": "~16.8.12",
     "@types/react-dom": "^16.0.6",
     "babel-cli": "^6.26.0",
     "babel-eslint": "^10.0.0",