Copyright for golang-github-mendersoftware-mender-artifact source package in Bullseye

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: mender-artifact
Source: https://github.com/mendersoftware/mender-artifact
Files-Excluded:
  vendor
  Godeps/_workspace

Files: *
Copyright: 2018-2019 Northern.tech AS
License: Apache-2.0

Files: debian/*
Copyright: 2018-2019 Andreas Henriksson 
License: Apache-2.0
Comment: Debian packaging is licensed under the same terms as upstream

License: Apache-2.0
 All content in this project is licensed under the Apache License v2, unless
 indicated otherwise.
 .
 On Debian systems, the complete text of the Apache License, Version 2
 can be found in "/usr/share/common-licenses/Apache-2.0".