code: func (c *Client) ConfigVarInfoByReleaseVersion(appIdentity, version string) (map[string]string, error) {
  	var configVar map[string]string
  	return configVar, c.Get(&configVar, fmt.Sprintf("/apps/%s/config-vars/%s", appIdentity, version))
  }
docs: // Get config-vars for app and release.
  //
  // appIdentity is the unique identifier of the ConfigVar's App.
  // version is the release version of the app.