Rubocop: automatic rule fixes.

Library/Homebrew/cask/lib/hbc/cask_loader.rb

Library/Homebrew/cask/lib/hbc/dsl.rb

Library/Homebrew/cask/lib/hbc/installer.rb

Library/Homebrew/cask/lib/hbc/system_command.rb

Library/Homebrew/caveats.rb

Library/Homebrew/cmd/unlinkapps.rb

Library/Homebrew/debrew/irb.rb

Library/Homebrew/dependency.rb

Library/Homebrew/dev-cmd/audit.rb

Library/Homebrew/dev-cmd/bottle.rb

Library/Homebrew/dev-cmd/bump-formula-pr.rb

Library/Homebrew/dev-cmd/pull.rb

Library/Homebrew/dev-cmd/release-notes.rb

Library/Homebrew/diagnostic.rb

Library/Homebrew/extend/ARGV.rb

Library/Homebrew/formula.rb

Library/Homebrew/formula_installer.rb

Library/Homebrew/keg.rb

Library/Homebrew/language/python.rb

Library/Homebrew/os/mac.rb