Copyright for r-cran-corrplot source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: corrplot
Upstream-Contact: Taiyun Wei 
Source: https://cran.r-project.org/package=corrplot

Files: *
Copyright: 2017 Taiyun Wei,
                Viliam Simko,
                Michael Levy,
                Yihui Xie,
                Yan Jin,
                Jeff Zemla
License: GPL

Files: debian/*
Copyright: 2019 Steffen Moeller 
License: GPL

License: GPL
 This package 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.
 .
 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.
 .
 You should have received a copy of the GNU General Public License
 along with this program. If not, see 
 .
 On Debian systems, the complete text of the GNU General
 Public License can be found in "/usr/share/common-licenses/GPL".