text: Title: Replacement for ast_to_dict?
  Body: I have been using [this](https://gist.github.com/mixxorz/dc36e180d1888629cf33#file-graphene-py-L59) function in the past, but it seems that `ast_to_dict` has been removed. Is there a replacement for `ast_to_dict` or a new function that is similiar to the one of the gist?