pr-upload: Add argument root-url
pr-upload: Add argument root-url

The argument root-url is needed for third-party taps.

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