A version parser for tags formed after the semantic versioning convention.
Parsing versions
import 'package:semver/semver.dart';
// from strings
var sm = new SemanticVersion.fromString('0.1.0');
// from maps
var myver = {'major': 10, 'minor': 5, 'patch': 1, build: '200'};
var sm = new SemanticVersion.fromMap(myver);
// directly
var newver = SemanticVersion(20, 10, 0, pre: 'alpha');Comparing versions
import 'package:semver/semver.dart';
var sm1 = new SemanticVersion.fromString('0.1.0+200');
var sm2 = new SemanticVersion.fromString('0.1.0+400');
assert(sm1 == sm2); // true
var sm3 = new SemanticVersion.fromString('0.1.0-alpha');
var sm4 = new SemanticVersion.fromString('0.1.0');
assert(sm3 < sm4); // true
