code: def vote_history(self, permlink, author=None):
          ''' Returns the raw vote history of a
          given post from a given account
          '''
          if author is None:
              author = self.mainaccount
          return self.steem_instance().get_active_votes(author, permlinkf vote_history(self, permlink, author=None):
          ''' Returns the raw vote history of a
          given post from a given account
          '''
          if author is None:
              author = self.mainaccount
          return self.steem_instance().get_active_votes(author, permlink)
docs: Returns the raw vote history of a
          given post from a given account