added missed GPL-2.0+

debian/copyright

@@ -5,7 +5,7 @@ Source: https://github.com/lxde/liblxqt
 Files: *
 Copyright: 2012-2014 LXQt team
            2010-2012 Razor team
-License: GPL-2.0 and LGPL-2.1+
+License: GPL-2.0+ and LGPL-2.1+
 
 Files: debian/*
 Copyright: 2014      Alf Gaida <agaida@siduction.org>
@@ -27,3 +27,20 @@ License: LGPL-2.1+
  .
  On Debian systems, the complete text of the GNU Lesser General
  Public License can be found in "/usr/share/common-licenses/LGPL-2.1".
+
+License: GPL-2.0+
+ This package 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 package 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, see <http://www.gnu.org/licenses/>
+ .
+ On Debian systems, the complete text of the GNU General
+ Public License version 2 can be found in "/usr/share/common-licenses/GPL-2".