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