fix up the copyright with the same preamble as the source

debian/copyright

@@ -6,17 +6,13 @@ Packaged by Fabio M. Di Nitto <fabbione@ubuntu.com>
 
 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; version 2 dated June, 1991.
+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 program; if not, write to the Free Software
-Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA.
+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 Ubuntu / Debian GNU/Linux systems, the complete text of the GNU
 General Public License can be found in `/usr/share/common-licenses/GPL'.