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/InvokableController.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Symfony\Component\Routing\Tests\Fixtures\AnnotationFixtures;
+
+use Symfony\Component\Routing\Annotation\Route;
+
+/**
+ * @Route("/here", name="lol")
+ */
+class InvokableController
+{
+    public function __invoke()
+    {
+    }
+}