Creative: Add myself in credits

Some people borrowed the creative code for their sub-games with an exclusive attribution to celeron55.

This is frustrating since I've largely rewritten, redesigned and carefully maintained this mod for the last months.

I expect to be credited.

mods/creative/README.txt

@@ -13,6 +13,7 @@ are added to the creative inventory.
 License of source code and media files:
 ---------------------------------------
 Copyright (C) 2012 Perttu Ahola (celeron55) <celeron55@gmail.com>
+Copyright (C) 2016 Jean-Patrick G. (kilbith) <jeanpatrick.guerrero@gmail.com>
 
 This program is free software. It comes without any warranty, to
 the extent permitted by applicable law. You can redistribute it