remove old new-style classes syntax

Python3 only supports "new-style" classes (those extending object),
and we don't need to explicitly inherit from this root class any more.
See http://pylint-messages.wikidot.com/messages:c1001

1 files changed, 1 insertions, 1 deletions

diff --git a/alot/ui.py b/alot/ui.py
index 3a111a40..2a156f68 100644
--- a/alot/ui.py
+++ b/alot/ui.py
@@ -34,7 +34,7 @@ async def periodic(callable_, period, *args, **kwargs):
         await asyncio.sleep(period)
 
 
-class UI(object):
+class UI:
     """
     This class integrates all components of alot and offers
     methods for user interaction like :meth:`prompt`, :meth:`notify` etc.