Update LICENSE

LICENSE

-
                                  Apache License
                            Version 2.0, January 2004
                         http://www.apache.org/licenses/
@@ -187,7 +186,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright 2012 THE ETHERPAD FOUNDATION
+   Copyright 2013 THE ETHERPAD FOUNDATION
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.