code: def remove_group_user(self, group_id, user_id):
          
          response = self._perform_request(
              url='/um/groups/%s/users/%s' % (group_id, user_id),
              method='DELETE')
  
          return response
docs: Removes a user from a group.
  
          :param      group_id: The unique ID of the group.
          :type       group_id: ``str``
  
          :param      user_id: The unique ID of the user.
          :type       user_id: ``str``