code: def usergroups_users_list(self, *, usergroup: str, **kwargs) -> SlackResponse:
          
          self._validate_xoxp_token()
          kwargs.update({"usergroup": usergroup})
          return self.api_call("usergroups.users.list", http_verb="GET", params=kwargs)
docs: List all users in a User Group
  
          Args:
              usergroup (str): The encoded ID of the User Group to update.
                  e.g. 'S0604QSJC'