/**
  * Singleton getter method. Returns the instance of our plugin or creates it.
  *
  * @since  1.0.0
  * @return TWT_Htaccess_Routing
  */
 public static function get_instance()
 {
     if (self::$instance instanceof TWT_Htaccess_Routing) {
         return self::$instance;
     }
     self::$instance = new TWT_Htaccess_Routing();
     return self::$instance;
 }