update-report: add how to check the outdated
update-report: add how to check the outdated

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