cask/cmd/style: don't hide warnings.
cask/cmd/style: don't hide warnings.

These sometimes display useful RuboCop deprecations.

sjackman/homebrew,EricFromCanada/brew,reitermarkus/brew,Homebrew/brew,vitorgalvao/brew,mahori/brew,sjackman/homebrew,MikeMcQuaid/brew,reitermarkus/brew,vitorgalvao/brew,claui/brew,vitorgalvao/brew,reitermarkus/brew,claui/brew,sjackman/homebrew,nandub/brew,MikeMcQuaid/brew,MikeMcQuaid/brew,EricFromCanada/brew,JCount/brew,claui/brew,konqui/brew,mahori/brew,sjackman/homebrew,konqui/brew,EricFromCanada/brew,mahori/brew,claui/brew,konqui/brew,nandub/brew,JCount/brew,konqui/brew,EricFromCanada/brew,nandub/brew,mahori/brew,JCount/brew,nandub/brew,vitorgalvao/brew,JCount/brew,Homebrew/brew,MikeMcQuaid/brew,reitermarkus/brew,Homebrew/brew,Homebrew/brew