Copyright for danmaq source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: danmaq
Source: https://github.com/tuna/danmaQ

Files: *
Copyright: 2015-2017 Justin Wong 
           2017, Harry Chen 
License: GPL-3

Files: debian/*
Copyright: 2017, Boyuan Yang <073plan@gmail.com>
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, version 3 of the License.
 .
 This program 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 the /usr/share/common-licenses/GPL-3 file.