Copyright for litmus source package in Bionic

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: litmus
Upstream-Contact: litmus@lists.manyfish.co.uk
Source: https://www.dulwich.io/
Debianized-By: Jelmer Vernooij 
Debianized-Date: 6 Mar 2017
Files-Excluded: lib/neon/* lib/expat/*

License: GPL-2+
 On Debian systems the full text of the GNU General Public License version 2
 can be found in the `/usr/share/common-licenses/GPL-2' file.

Files: *
Copyright:
 1998-2011 Joe Orton 
 2004 Aleix Conchillo Flaque 
License: GPL-2+