Code cleanup [skip ci]

app/Exceptions/Handler.php

@@ -1,4 +1,12 @@
 <?php
+/**
+ * Handler.php
+ * Copyright (C) 2016 thegrumpydictator@gmail.com
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
 declare(strict_types = 1);
 namespace FireflyIII\Exceptions;