Copyright for wmmon source package in Bionic

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: WMMon
Upstream-Contact: Window Maker Devel Group 
Source: http://www.dockapps.net/wmmon

Files: *
Copyright: 1997, 1998 by Martijn Pieterse and Antoine Nulle
License: GPL-2+

Files: debian/*
Copyright: 1998-2002, Fredrik Hallenberg  
           2003-2004, Simon Law 
           2001, Neil Williams 
           2011, Rodolfo García Peñas (kix) 
License: GPL-2+

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.
 .
 You should have received a copy of the GNU General Public
 License along with this package; if not, write to the Free
 Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 Boston, MA  02110-1301 USA
 .
 On Debian systems, the full text of the GNU General Public
 License version 2 can be found in the file
 `/usr/share/common-licenses/GPL-2'.