Update COPYING

Inc. Goonstation to license.

COPYING

@@ -1,5 +1,5 @@
 Paradise
-Copyright (C) 2010-2014 Paradise, Baystation12 and tgstation13.
+Copyright (C) 2010-2016 Paradise, Baystation12, Goonstation and tgstation13.
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -13,3 +13,7 @@ GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+
+Any files located in the Paradise/goon, Paradise/icons/goonstation, or Paradise/sound/goonstation directories, or any subdirectories of mentioned directories are licensed under the Creative Commons 3.0 BY-NC-SA license (https://creativecommons.org/licenses/by-nc-sa/3.0) from Goonstation.