Copyright for goocalendar source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/

Files: *
Copyright: 2012 Antoine Smolders
           2012-2019 Cédric Krier
           2007 Samuel Abels 
License: GPL-2

Files: debian/*
Copyright: 2013-2019 Mathias Behrle 
License: GPL-2

License: GPL-2
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License version 2, as
 published by the Free Software Foundation.
 .
 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.
 .
 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software Foundation,
 Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
 .
 The complete text of the GNU General Public License
 can be found in /usr/share/common-licenses/GPL-2 file.