Publish home-brew formula.

[jmalloc]

This might be useful, but there's probably a GitHub action to do it nowadays.

[jmalloc]

Formula API Reference: https://rubydoc.brew.sh/Formula

Re: shell completion, see:

• https://docs.brew.sh/Shell-Completion
• https://github.com/go-task/homebrew-tap/blob/master/Formula/go-task.rb#L18 (and https://github.com/go-task/task/tree/master/completion)