TT#34318 Update year in debian/copyright

Change-Id: I2735c58346c98730e75e2cf54b6e3d23eff3f654

debian/copyright

@@ -4,7 +4,7 @@ Upstream-Contact: Sipwise Development Team <support@sipwise.com>
 
 Files: *
 Copyright:
- Copyright © 2007-2016 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