update-report: summarize updated casks for --preinstall
update-report: summarize updated casks for --preinstall

Also, show less output if --quiet is passed.

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