Add 2011-2013 to copyright years


git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@5617 4407c894-4637-0410-b4f5-ada5f102cad1

COPYING.MinGW-w64-runtime/COPYING.MinGW-w64-runtime.txt

diff --git a/COPYING.MinGW-w64-runtime/COPYING.MinGW-w64-runtime.txt b/COPYING.MinGW-w64-runtime/COPYING.MinGW-w64-runtime.txt
index 3d11e87..ca6a077 100644
--- a/COPYING.MinGW-w64-runtime/COPYING.MinGW-w64-runtime.txt
+++ b/COPYING.MinGW-w64-runtime/COPYING.MinGW-w64-runtime.txt
@@ -12,7 +12,7 @@
 Overall copyright notice
 ========================
 
-Copyright (c) 2009, 2010 by the mingw-w64 project
+Copyright (c) 2009, 2010, 2011, 2012, 2013 by the mingw-w64 project
 
 This license has been certified as open source. It has also been designated
 as GPL compatible by the Free Software Foundation (FSF).