Copyright for unity-mail source package in Bionic

Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: Unity Mail
Source: https://tari.in/www/software/unitymail/

Files: *
Copyright: 2011-2014 Dmitry Shachnev 
           2016-2017 Robert Tari 
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 of the License, or
 (at your option) any later version.
 .
 This package is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 GNU General Public License for more details.
 .
 On Debian systems, the complete text of the GNU General Public License
 version 3 can be found in "/usr/share/common-licenses/GPL-3".