Copyright for rust-tiny-keccak source package in Lunar

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: tiny-keccak
Upstream-Contact: debris 

Files: *
Copyright: 2019-2020 debris 
License: CC0-1.0

Files: debian/*
Copyright:
 2020 Debian Rust Maintainers 
 2020 Sylvestre Ledru 
License: CC0-1.0

License: CC0-1.0
 Debian systems provide the CC0 1.0 Universal License in
 /usr/share/common-licenses/CC0-1.0