Laravel 5.6 updates

Travis config update

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

vendor/symfony/http-foundation/Tests/Session/Storage/Proxy/NativeProxyTest.php

@@ -1,38 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\HttpFoundation\Tests\Session\Storage\Proxy;
-
-use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpFoundation\Session\Storage\Proxy\NativeProxy;
-
-/**
- * Test class for NativeProxy.
- *
- * @group legacy
- *
- * @author Drak <drak@zikula.org>
- */
-class NativeProxyTest extends TestCase
-{
-    public function testIsWrapper()
-    {
-        $proxy = new NativeProxy();
-        $this->assertFalse($proxy->isWrapper());
-    }
-
-    public function testGetSaveHandlerName()
-    {
-        $name = ini_get('session.save_handler');
-        $proxy = new NativeProxy();
-        $this->assertEquals($name, $proxy->getSaveHandlerName());
-    }
-}