fix: Remove deprecated bottle :unneeded

[timbeadle]

Remove bottle :unneeded from brew formula.

bottle :unneeded now provokes a warning from Homebrew: Warning: Calling bottle :unneeded is deprecated! There is no replacement.

Homebrew apparently deprecated bottle :unneeded in Homebrew/brew@f65d525

[timbeadle]

@bryanbraun Would you be ok to review this PR pls?

[nitrocode]

Is this why brew tap sparkbox/commit-colors fails ?

Yep, just tested it and that's why it fails. I was able to get it working using the following.

mkdir -p /usr/local/Homebrew/Library/Taps/sparkbox/
git clone git@github.com:sparkbox/homebrew-commit-colors.git /usr/local/Homebrew/Library/Taps/sparkbox/homebrew-commit-colors
brew search commit-colors
brew install commit-colors

There's also a new generic homebrew tap repo for sparkbox where this formula could be migrated. The current sb formula there was added recently by @robtarr and doesn't contain the deprecated bottle :unneeded argument.

https://github.com/sparkbox/homebrew-brew

I added a PR for it here sparkbox/homebrew-brew#3