[Doc] Fixed license year

Author: pborreli

contributing/code/license.rst

@@ -14,7 +14,7 @@ According to `Uncyclopedia`_:
 The License
 -----------
 
-Copyright (c) 2004-2010 Fabien Potencier
+Copyright (c) 2004-2011 Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal