cask: add DSL methods to RBI file
cask: add DSL methods to RBI file

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