use a correct version number for 2.x

debian/gbp.conf

+[git-buildpackage]
+debian-branch = 2.x

monkeysign/__init__.py

 # -*- coding: utf-8 -*-
 
-__version_info__ = ('1', '1')
+__version_info__ = ('2', '0-dev')
 __version__ = '.'.join(__version_info__)
 __copyright__ = """Copyright (C) 2010-2013  Antoine Beaupré, Jerome Charaoui
 This program comes with ABSOLUTELY NO WARRANTY.