COPYING: update copyright year
Copyright (C) 2008 John Paulett (john -at- paulett.org)
-Copyright (C) 2009-2016 David Aguilar (davvid -at- gmail.com)
+Copyright (C) 2009-2018 David Aguilar (davvid -at- gmail.com)
All rights reserved.
Redistribution and use in source and binary forms, with or without
