Fix shebang so brew bundle works on Linux
Fix shebang so brew bundle works on Linux

This commit fixes the shebang in /cmd/brew-bundle so that the script can
be run on Linux. Previously, Linux tried to call the executable "ruby
-W0" because of the space, which is an executable that doesn't exist.

Now the shebang will just call the executable "ruby", and we set the
verbosity to 0 in the script by declaring "$VERBOSE = nil".

gabebw/homebrew-bundle,pvdb/brewdler,voanhduy1512/homebrew-bundle,Homebrew/homebrew-bundle