Fixed issue with ubuntu

See anki#215

Author: Paillat-dev

src/cozmo/event.py

@@ -485,7 +485,7 @@ async def wait_for(self, event_or_filter, timeout=30):
 
         self.add_event_handler(event, f)
         if timeout:
-             return await asyncio.wait_for(f, timeout, loop=self._loop)
+             return await asyncio.wait_for(f, timeout)
         return await f