Notice: Require permission_callback

Since WordPress 5.5.0 there is the following notice caused by this plugin.

Notice: register_rest_route was called incorrectly. The REST API route definition for whm/v3/themesettings is missing the required permission_callback argument. For REST API routes that are intended to be public, use __return_true as the permission callback.

The fix is really simple and should be included in the next update to remove this notice. You just need to add 'permission_callback' => '__return_true' to both register_rest_route calls inside class-template-designer.php. Thanks!