TT#61954 Update copyright years

Change-Id: If1c22185eb757507b4fbb30d6739e82517b6050e

debian/copyright

@@ -5,7 +5,7 @@ Upstream-Contact: Sipwise Development Team <support@sipwise.com>
 Files:
  *
 Copyright:
- Copyright © 2006 Sipwise GmbH, Austria
+ Copyright © 2006-2019 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