Generate version number by git history inspired by python-pbr
npm install gitverThis is a Nodejs library.
Command line
```
$ gitver versionexpect output 0.0.1.dev
库的使用
`
var gv = require('git-tag-version')
gv.current(function(version){
console.log(version) // expect: 0.0.1
})
`
If recent git tag` is v0.0.2, then function will return 0.0.2 or 0.0.3.dev