Returns a generator with the plans in a given project
        :param project_key: Project key
        :return: Generator with plans

def project_plans(self, project_key):
        """
        Returns a generator with the plans in a given project
        :param project_key: Project key
        :return: Generator with plans
        """
        resource = 'project/{}'.format(project_key, max_results=25)
        return self.base_list_call(resource, expand='plans', favourite=False, clover_enabled=False, max_results=25,
                                   elements_key='plans', element_key='plan')