Command to release a new version of a plugin
something like `sketch-builder release [major|minor|patch]`:
   * `npm version ...`
   * `sketch-builder build`
   * `zip plugin`
   * `git push`
   * use github api to create release
   * upload zip

https://github.com/atom/apm/blob/master/src
https://gist.github.com/caspyin/2288960
https://github.com/aktau/github-release
