code: def rollback_group(self, group_id, version, force=False):
          
          params = {'force': force}
          response = self._do_request(
              'PUT',
              '/v2/groups/{group_id}/versions/{version}'.format(
                  group_id=group_id, version=version),
              params=params)
          return response.json()
docs: Roll a group back to a previous version.
  
          :param str group_id: group ID
          :param str version: group version
          :param bool force: apply even if a deployment is in progress
  
          :returns: a dict containing the deployment id and version
          :rtype: dict