Laravel 5.6 updates

Travis config update

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

vendor/symfony/console/Helper/TableRows.php

@@ -0,0 +1,32 @@
+<?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\Console\Helper;
+
+/**
+ * @internal
+ */
+class TableRows implements \IteratorAggregate
+{
+    private $generator;
+
+    public function __construct(callable $generator)
+    {
+        $this->generator = $generator;
+    }
+
+    public function getIterator()
+    {
+        $g = $this->generator;
+
+        return $g();
+    }
+}