Copyright for rust-html2pango source package in Mantic

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: html2pango
Upstream-Contact:
 Daniel García Moreno 
 Jordan Petridis 
Source: https://gitlab.gnome.org/World/html2pango

Files: *
Copyright:
 2018-2019 Daniel García Moreno 
 2018-2020 Jordan Petridis 
License: GPL-3.0

Files: debian/*
Copyright:
 2020 Debian Rust Maintainers 
 2020 Henry-Nicolas Tourneur 
License: GPL-3.0

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