Update license.txt

license.txt

 MIT License
 
-Copyright (c) <2012> <Taylor Otwell> <taylorotwell@gmail.com>
+Copyright (c) <2013> <Taylor Otwell> <taylorotwell@gmail.com>
 
 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
@@ -43,4 +43,4 @@ By making a contribution to this project, I certify that:
     are public and that a record of the contribution (including all
     personal information I submit with it, including my sign-off) is
     maintained indefinitely and may be redistributed consistent with
-    this project or the open source license(s) involved.
\ No newline at end of file
+    this project or the open source license(s) involved.