TT#49102 Update copyright years

Change-Id: I4038b83b1bd2481f525826886c8af919970811df

debian/copyright

@@ -4,7 +4,7 @@ Upstream-Contact: Sipwise Development Team <support@sipwise.com>
 
 Files: *
 Copyright:
- Copyright © 2007-2015 Sipwise GmbH, Austria
+ Copyright © 2007-2018 Sipwise GmbH, Austria
 License: GPL-3+
  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