Laravel 5.6 updates

Travis config update

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

vendor/symfony/routing/Tests/Loader/AnnotationFileLoaderTest.php

@@ -35,9 +35,6 @@ class AnnotationFileLoaderTest extends AbstractAnnotationLoaderTest
         $this->loader->load(__DIR__.'/../Fixtures/AnnotatedClasses/FooClass.php');
     }
 
-    /**
-     * @requires PHP 5.4
-     */
     public function testLoadTraitWithClassConstant()
     {
         $this->reader->expects($this->never())->method('getClassAnnotation');
@@ -54,9 +51,6 @@ class AnnotationFileLoaderTest extends AbstractAnnotationLoaderTest
         $this->loader->load(__DIR__.'/../Fixtures/OtherAnnotatedClasses/NoStartTagClass.php');
     }
 
-    /**
-     * @requires PHP 5.6
-     */
     public function testLoadVariadic()
     {
         $route = new Route(array('path' => '/path/to/{id}'));