Laravel 5.6 updates

Travis config update

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

vendor/symfony/routing/Tests/Fixtures/AnnotationFixtures/RouteWithPrefixController.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Symfony\Component\Routing\Tests\Fixtures\AnnotationFixtures;
+
+use Symfony\Component\Routing\Annotation\Route;
+
+/**
+ * @Route("/prefix")
+ */
+class RouteWithPrefixController
+{
+    /**
+     * @Route("/path", name="action")
+     */
+    public function action()
+    {
+    }
+}