Fork with ^1.0.0 (caret), ~1.0.0 (tilda), 2 - 4 (subtraction range?) without any regex

[Jarred-Sumner]

In this fork, I added support for the following:

        {[][]string{{"~1.2.1"}}, [][]string{{"<1.3.0", ">=1.2.1"}}},
		{[][]string{{"^1.2.1"}}, [][]string{{"<2.0.0", ">=1.2.1"}}},
		{[][]string{{"~>1.2.x"}}, [][]string{{">=1.2.0"}}},
		{[][]string{{"~>1.x"}}, [][]string{{">=1.0.0"}}},
		{[][]string{{"1.*"}}, [][]string{{">=1.0.0", "<2.0.0"}}},
		{[][]string{{"1.2.*"}}, [][]string{{">=1.2.0", "<1.3.0"}}},
		{[][]string{{"*"}}, [][]string{{">=0.0.0"}}},
		{[][]string{{"8.0.0 - 10.0.0"}}, [][]string{{"<10.0.0", ">=8.0.0"}}},
		{[][]string{{"8 - 10"}}, [][]string{{"<10.0.0", ">=8.0.0"}}},
		{[][]string{{"8 - 10.1"}}, [][]string{{"<10.1.0", ">=8.0.0"}}},
		{[][]string{{" 8 "}}, [][]string{{"8.0.0"}}},
		{[][]string{{" 800000 "}}, [][]string{{"800000.0.0"}}},
		{[][]string{{" ~7.x "}}, [][]string{{"<8.0.0", ">=7.0.0"}}},
		{[][]string{{" ~7.0.x "}}, [][]string{{"<7.1.0", ">=7.0.0"}}},
		{[][]string{{" ~* "}}, [][]string{{">=0.0.0"}}},

It does not allocate more memory. But, it's about 8% slower. Do you want me submit a PR?

goos: darwin
goarch: amd64
pkg: github.com/Jarred-Sumner/semver/v4
cpu: Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz
BenchmarkRangeParseSimple-16        	 2402451	       493.4 ns/op	     224 B/op	       7 allocs/op
BenchmarkRangeParseAverage-16       	 1235457	       967.9 ns/op	     456 B/op	      13 allocs/op
BenchmarkRangeParseComplex-16       	  392412	      3129 ns/op	    1736 B/op	      39 allocs/op
BenchmarkRangeMatchSimple-16        	100000000	        11.32 ns/op	       0 B/op	       0 allocs/op
BenchmarkRangeMatchAverage-16       	48316423	        25.28 ns/op	       0 B/op	       0 allocs/op
BenchmarkRangeMatchComplex-16       	17318359	        70.28 ns/op	       0 B/op	       0 allocs/op
BenchmarkRangeMatchNPM-16           	27442455	        43.70 ns/op	       0 B/op	       0 allocs/op
BenchmarkParseSimple-16             	 8453367	       139.5 ns/op	      48 B/op	       1 allocs/op
BenchmarkParseComplex-16            	 1795279	       687.0 ns/op	     256 B/op	       7 allocs/op
BenchmarkParseAverage-16            	 2672629	       466.3 ns/op	     163 B/op	       4 allocs/op
BenchmarkParseTolerantAverage-16    	 3093957	       394.1 ns/op	     132 B/op	       4 allocs/op
BenchmarkStringSimple-16            	40966444	        30.76 ns/op	       5 B/op	       1 allocs/op
BenchmarkStringLarger-16            	17750650	        65.63 ns/op	      32 B/op	       2 allocs/op
BenchmarkStringComplex-16           	12103804	        98.85 ns/op	      80 B/op	       3 allocs/op
BenchmarkStringAverage-16           	13836576	        89.55 ns/op	      45 B/op	       2 allocs/op
BenchmarkValidateSimple-16          	441872518	         2.589 ns/op	       0 B/op	   0 allocs/op
BenchmarkValidateComplex-16         	 7224438	       151.2 ns/op	       0 B/op	       0 allocs/op
BenchmarkValidateAverage-16         	13011160	        88.88 ns/op	       0 B/op	       0 allocs/op
BenchmarkCompareSimple-16           	309173464	         3.999 ns/op	       0 B/op	   0 allocs/op
BenchmarkCompareComplex-16          	82620462	        12.37 ns/op	       0 B/op	       0 allocs/op
BenchmarkCompareAverage-16          	68264864	        17.24 ns/op	       0 B/op	       0 allocs/op
BenchmarkSort-16                    	 7555494	       160.2 ns/op	     248 B/op	       2 allocs/op
PASS
ok  	github.com/Jarred-Sumner/semver/v4	31.099s

Fair warning that this is my ~4th day of writing go.