Copyright for core-async-clojure source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: core.async
Source: http://github.com/clojure/core.async

Files: *
Copyright: Copyright (C) 2017 Rich Hickey and contributors
License: EPL-1.0

Files: debian/*
Copyright: 2017 Apollon Oikonomopoulos