Add `brew typecheck` to pull request template.
Add `brew typecheck` to pull request template.

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