Fix copyright

Author: VladimirZaets

lib/internal/Magento/Framework/ObjectManager/Factory/AbstractFactory.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Copyright © 2013-2018 Magento, Inc. All rights reserved.
+ * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
 namespace Magento\Framework\ObjectManager\Factory;