Add missing style.css update

Author: EvanHerman

style.css

@@ -6,7 +6,7 @@
  * Author:       GoDaddy
  * Author URI:   https://www.godaddy.com
  * Version:      1.8.11
- * Tested up to: 6.6
+ * Tested up to: 6.7
  * Requires PHP: 5.6
  * License:      GPL-2.0
  * License URI:  https://www.gnu.org/licenses/gpl-2.0.html