code: def set_user_project_permission(self, project_id, user_id, auth_role):
          
          put_data = {
              "auth_role[id]": auth_role
          }
          return self._put("/projects/" + project_id + "/permissions/" + user_id, put_data,
                           content_type=ContentType.form)
docs: Send PUT request to /projects/{project_id}/permissions/{user_id/ with auth_role value.
          :param project_id: str uuid of the project
          :param user_id: str uuid of the user
          :param auth_role: str project role eg 'project_admin'
          :return: requests.Response containing the successful result