Laravel 5.6 updates

Travis config update

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

vendor/symfony/http-kernel/Client.php

@@ -25,8 +25,8 @@ use Symfony\Component\HttpFoundation\Response;
  *
  * @author Fabien Potencier <fabien@symfony.com>
  *
- * @method Request|null  getRequest()  A Request instance
- * @method Response|null getResponse() A Response instance
+ * @method Request  getRequest()  A Request instance
+ * @method Response getResponse() A Response instance
  */
 class Client extends BaseClient
 {
@@ -168,7 +168,6 @@ EOF;
                         '',
                         $value->getClientOriginalName(),
                         $value->getClientMimeType(),
-                        0,
                         UPLOAD_ERR_INI_SIZE,
                         true
                     );
@@ -177,7 +176,6 @@ EOF;
                         $value->getPathname(),
                         $value->getClientOriginalName(),
                         $value->getClientMimeType(),
-                        $value->getClientSize(),
                         $value->getError(),
                         true
                     );