Copyright for flwm source package in Bionic

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: The Fast Light Window Manager
Upstream-Contact: Bill Spitzak  
Source: http://flwm.sourceforge.net/

Files: *
Copyright: 1998-2015 Bill Spitzak 
License: GPL-2+

Files: debian/*
Copyright: 2008-2011 Patrick Matthäi ,
           2011-2017 Axel Beckert 
License: GPL-2+
Comment:
 This software was debianized by Tommi Virtanen  on
 Tue, 9 Mar 1999 14:18:03 +0200. Since Sun, 6 Mar 2005 11:07:46 +0100
 the package was maintained by Bill Allombert
 . The packaging was rewritten based on debhelper
 by Patrick Matthäi on 3rd of May 2008.

License: GPL-2+
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or (at
 your option) any later version.
 .
 This program is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 General Public License for more details.
 .
 On Debian GNU/Linux systems, the complete text of the GNU General
 Public License can be found in '/usr/share/common-licenses/GPL-2'.