Copyright for ipv6pref source package in Bionic

Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: ipv6pref
Maintainer-Contact: Stefan Tomanek 
Source: https://github.com/wertarbyte/ipv6pref

Files: *
Copyright: 2010-2016, Stefan Tomanek
License: GPL-3+

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 the
 Free Software Foundation; either version 3, or (at your option) any
 later version.
 .
 On Debian systems, the complete text of version 3 of the GNU General
 Public License can be found in `/usr/share/common-licenses/GPL-3'.