Fix logger usage

hbmqtt/plugins/logging.py

@@ -10,12 +10,11 @@ from functools import partial
 
 class EventLoggerPlugin:
     def __init__(self, context):
-        self.logger = logging.getLogger(__name__)
         self.context = context
 
     @asyncio.coroutine
     def log_event(self, *args, **kwargs):
-        self.logger.info("### '%s' EVENT FIRED ###" % kwargs['event_name'].replace('old', ''))
+        self.context.logger.info("### '%s' EVENT FIRED ###" % kwargs['event_name'].replace('old', ''))
 
     def __getattr__(self, name):
         if name.startswith("on_"):