Copyright for ytcc source package in Focal

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

Files: *
Copyright: 2019 Wolfgang Popp
License: GPL-3+

Files: debian/*
Copyright: 2019 Frédéric Bonnard 
License: GPL-3+

License: GPL-3+
 On Debian systems the full text of the GPL-3 can be found in
 /usr/share/common-licenses/GPL-3