docs: def plan_branches(self, plan_key, expand=None, favourite=False, clover_enabled=False, max_results=25):
          """api/1.0/plan/{projectKey}-{buildKey}/branch"""
          resource = 'plan/{}/branch'.format(plan_key)
          return self.base_list_call(resource, expand, favourite, clover_enabled, max_results,
                                     elements_key='branches', element_key='branch')