Remove header comments

Author: emonkak

src/Set.php

@@ -1,11 +1,4 @@
 <?php
-/**
- * This file is part of the Emonkak\Collection.php package.
- *
- * Copyright (C) 2013 Shota Nozaki <emonkak@gmail.com>
- *
- * Licensed under the MIT License
- */
 
 namespace Emonkak\Collection;