Update copyright for 2013.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/io/trunk@1440629 13f79535-47bb-0310-9956-ffa450edef68

Author: garydgregory

NOTICE.txt

@@ -1,5 +1,5 @@
 Apache Commons IO
-Copyright 2002-2012 The Apache Software Foundation
+Copyright 2002-2013 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).