Add 2013 as copyright year.


git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@5618 4407c894-4637-0410-b4f5-ada5f102cad1
diff --git a/COPYING b/COPYING
index c65b05f..28fa951 100644
--- a/COPYING
+++ b/COPYING
@@ -2,7 +2,7 @@
 in the Public Domain, BSD, or LGPL this Software is provided under the
 Zope Public License (ZPL) Version 2.1.
 
-Copyright (c) 2009 - 2012 by the mingw-w64 project
+Copyright (c) 2009 - 2013 by the mingw-w64 project
 
 See the AUTHORS file for the list of contributors to the mingw-w64 project.