Copyright for rust-sniffglue source package in Mantic

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

Files: *
Copyright: 2017-2020 kpcyrd 
License: GPL-3.0

Files: debian/*
Copyright:
 2018-2021 Debian Rust Maintainers 
 2018-2021 kpcyrd 
License: GPL-3.0

License: GPL-3.0
 Debian systems provide the GPL 3.0 in /usr/share/common-licenses/GPL-3