Copyright for gtick source package in Xenial

This package was initially debianized by Cord Beermann  on
Mon, 29 Oct 2001 22:00:04 +0100.
Currently maintained by Roland Stigge 
Mon, 13 Oct 2003 12:29:47 +0200

It was downloaded from http://www.antcom.de/download/gtick/

Copyright (C) 1999 Alex Roberts  (original author)
Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Roland Stigge
 (current maintainer)

You are free to distribute this software under the terms of
the GNU General Public License, version 3. On Debian systems, a copy of this
license can be found at /usr/share/common-licenses/GPL-3.