Laravel 5.6 updates

Travis config update

Removed HHVM script as Laravel no longer support HHVM after releasing 5.3

vendor/symfony/http-kernel/DataCollector/DataCollectorInterface.php

@@ -18,8 +18,6 @@ use Symfony\Component\HttpFoundation\Response;
  * DataCollectorInterface.
  *
  * @author Fabien Potencier <fabien@symfony.com>
- *
- * @method reset() Resets this data collector to its initial state.
  */
 interface DataCollectorInterface
 {
@@ -34,4 +32,9 @@ interface DataCollectorInterface
      * @return string The collector name
      */
     public function getName();
+
+    /**
+     * Resets this data collector to its initial state.
+     */
+    public function reset();
 }