Update license year in test file

Author: dmanners

lib/internal/Magento/Framework/Phrase/Test/Unit/Renderer/InlineTest.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Copyright © 2013-2017 Magento, Inc. All rights reserved.
+ * Copyright © 2013-2018 Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
 namespace Magento\Framework\Phrase\Test\Unit\Renderer;