Readme date modification

Author: piac

README.md

@@ -48,7 +48,7 @@ Giulio Piacentino - https://github.com/piac giulio@mcneel.com
 
 Legal Stuff
 -----------
-Copyright (c) 2011 Robert McNeel & Associates. All Rights Reserved.
+Copyright (c) 2011-2013 Robert McNeel & Associates. All Rights Reserved.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in