docs: def remove_user_from_group(self, username, groupname):
          """Remove a user from a group.
  
          :param username: The user to remove from the group.
          :param groupname: The group that the user will be removed from.
          """
          url = self._options['server'] + '/rest/api/latest/group/user'
          x = {'groupname': groupname,
               'username': username}
  
          self._session.delete(url, params=x)
  
          return True