Copyright for libmatekbd source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: libmatekbd
Upstream-Contact: Martin Wimpress 
Source: https://git.mate-desktop.org/libmatekbd

Files: *
Copyright: 2006, Sergey V. Udaltsov 
           2009, Sergey V. Udaltsov 
License: LGPL-2+

Files: debian/*
Copyright: 2011-2014 Stefano Karapetsas 
           2013-2015 Mike Gabriel 
           2015 Martin Wimpress 
License: LGPL-2+

License: LGPL-2+
 This library is free software; you can redistribute it and/or modify
 it under the terms of the GNU Library General Public License as
 published by the Free Software Foundation; either version 2 of the
 License, or (at your option) any later version.
 .
 See /usr/share/common-licenses/LGPL-2 for the full license text.