Copyright for r-cran-lava source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: lava
Upstream-Contact: Klaus K. Holst 
Source: https://cran.r-project.org/package=lava

Files: *
Copyright: 2013-2017 Klaus K. Holst, Brice Ozenne, Thomas Gerds
License: GPL-3

Files: debian/*
Copyright: 2017 Andreas Tille 
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 of the License, or
    (at your option) any later version.
 .
    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 "/usr/share/common-licenses/GPL-3".