bump-cask-pr: support separate downloads for Intel and ARM
bump-cask-pr: support separate downloads for Intel and ARM

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