Copyright notices. [skip ci]

Signed-off-by: James Cole <thegrumpydictator@gmail.com>

app/Repositories/Bill/BillRepository.php

@@ -1,4 +1,12 @@
 <?php
+/**
+ * BillRepository.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\Repositories\Bill;