Publish a release, so Homebrew formula can be updated

[nomaed]

I saw that the original zsh-git-prompt is used as the source in Homebrew:
https://github.com/Homebrew/homebrew-core/blob/master/Formula/zsh-git-prompt.rb

It would be quite useful to update the formula to use this fork with all the fixes and updates. However, seeing how it's structured, I think that it requires a release with a tar.gz file.

@starcraftman would it be possible to publish a release please, or maybe you know how to change the homebrew formula to use your fork?

[qolii]

This, please! (For Nixpkgs)