change license to ALv2

debian/copyright

@@ -4,19 +4,5 @@ Source: https://bitbucket.org/OscarAcena/pygattlib
 
 Files: *
 Copyright: 2014 Oscar Aceña Herrera <oscaracena@gmail.com>
-License: GPL-3+
- 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 3 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 3 can be found in "/usr/share/common-licenses/GPL-3".
+License: ALv2
+