Added license header

Author: wouterj

src/ErrorHandler/DeprecationErrorHandler.php

@@ -1,5 +1,16 @@
 <?php
 
+/*
+ * This file is part of the Symfony CMF package and was copied
+ * from the Symfony package.
+ *
+ * (c) Fabien Potencier <[email protected]>
+ * (c) 2011-2014 Symfony CMF
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Symfony\Cmf\Component\Testing\ErrorHandler;
 
 /**