Copyright for golang-github-coreos-semver source package in Bionic

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

Files: *
Copyright: 2013-2015 CoreOS, Inc. 
License: Apache-2.0

Files: debian/*
Copyright: 2015 Tim Potter 
License: Apache-2.0
Comment: the Debian packaging is licensed under the same terms as the original package.

License: Apache-2.0
 On Debian systems, the full text of the Apache-2.0 license
 can be found in the file '/usr/share/common-licenses/Apache-2.0'