Update copyright info

Author: ddemidov

debian/copyright

@@ -5,9 +5,13 @@ Copyright: 2016 Ralph Hempel <rhempel@hempeldesigngroup.com>
 Files: *
 License: MIT
 Copyright: 2016 Ralph Hempel <rhempel@hempeldesigngroup.com>
-Copyright: 2015 Denis Demidov <dennis.demidov@gmail.com>
+Copyright: 2015-2016 Denis Demidov <dennis.demidov@gmail.com>
 Copyright: 2015 Eric Pascual <eric@pobot.org>
 Copyright: 2015 Anton Vanhoucke <antonvh@gmail.com>
+Copyright: 2016 Kaelin Laundry <wasabifan@outlook.com>
+Copyright: 2016 Daniel Walton <dwalton76@gmail.com>
+Copyright: 2016 Donald Webster <fryfrog@gmail.com>
+Copyright: 2016 Frank Busse <bb0xfb@gmail.com>
 
 License: MIT
  Permission is hereby granted, free of charge, to any person obtaining a