Copyright for yatm source package in Xenial

This package was debianized by Mario Lang  on
Mon, 8 Jun 2004 23:36:16 +0100.

Copyright: 2004, 2005, 2006 Mario Lang

  Yatm 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 systems, the complete text of the GNU General Public License
can be found in `/usr/share/common-licenses/GPL'.