Laravel 5.6 updates

Travis config update

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

vendor/symfony/http-foundation/FileBag.php

@@ -84,7 +84,7 @@ class FileBag extends ParameterBag
                 if (UPLOAD_ERR_NO_FILE == $file['error']) {
                     $file = null;
                 } else {
-                    $file = new UploadedFile($file['tmp_name'], $file['name'], $file['type'], $file['size'], $file['error']);
+                    $file = new UploadedFile($file['tmp_name'], $file['name'], $file['type'], $file['error']);
                 }
             } else {
                 $file = array_map(array($this, 'convertFileInformation'), $file);