Wrap `brew-cu` into noninteractive `brew-cask` upgrade command
Wrap `brew-cu` into noninteractive `brew-cask` upgrade command

Allows for calling of this command with `brew cask upgrade`, better matching the existing homebrew style

buo/brew-cask-upgrade,buo/brew-cask-upgrade,buo/homebrew-cask-upgrade,buo/homebrew-cask-upgrade