code: func (c *Client) AppFeatureUpdate(appIdentity string, appFeatureIdentity string, enabled bool) (*AppFeature, error) {
  	params := struct {
  		Enabled bool `json:"enabled"`
  	}{
  		Enabled: enabled,
  	}
  	var appFeatureRes AppFeature
  	return &appFeatureRes, c.Patch(&appFeatureRes, "/apps/"+appIdentity+"/features/"+appFeatureIdentity, params)
  }
docs: // Update an existing app feature.
  //
  // appIdentity is the unique identifier of the AppFeature's App.
  // appFeatureIdentity is the unique identifier of the AppFeature. enabled is the
  // whether or not app feature has been enabled.