Copyright for golang-github-gmazoyer-peeringdb source package in Jammy

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

Files: *
Copyright: 2016 Guillaume Mazoyer
License: GPL-3.0

Files: debian/*
Copyright: 2021 Thorsten Alteholz 
License: GPL-3.0
Comment: Debian packaging is licensed under the same terms as upstream

License: GPL-3.0
 On Debian systems the full text of the GPL-3 can be found in
 /usr/share/common-licenses/GPL-3