生成 changelog 

可以使用 `conventional-changelog-cli`;

```
$ npm i --save-dev git://github.com/kazupon/git-commit-message-convention.git
$ conventional-changelog -i CHANGELOG.md -s -n ./node_modules/git-commit-message-convention/convention.js -r 0
```

https://github.com/kazupon/git-commit-message-convention