Update copyright year.

2013-03-13 11:50:05 -07:00 · 2013-03-13 11:50:05 -07:00 · e64b622063
--- a/2
+++ b/2
@ -1,4 +1,4 @@
-Copyright (c) 2012, Michael Bostock
+Copyright (c) 2013, Michael Bostock
 All rights reserved.

 Redistribution and use in source and binary forms, with or without