kitty: Unsupported special dependency :python3

[richmidwinter]

Similar to #7 perhaps though #6 sounds like it might offer a better fix.

$ brew install --HEAD cema-sp/homebrew-tap/alacritty
==> Tapping cema-sp/tap
Cloning into '/usr/local/Homebrew/Library/Taps/cema-sp/homebrew-tap'...
remote: Counting objects: 8, done.
remote: Compressing objects: 100% (8/8), done.
remote: Total 8 (delta 0), reused 6 (delta 0), pack-reused 0
Unpacking objects: 100% (8/8), done.
Error: Invalid formula: /usr/local/Homebrew/Library/Taps/cema-sp/homebrew-tap/Formula/kitty.rb
kitty: Unsupported special dependency :python3
Error: Cannot tap cema-sp/tap: invalid syntax in tap!