Switch to non-deprecated method in event.py

Author: linuxdaemon

cloudbot/event.py

@@ -157,7 +157,7 @@ def prepare(self):
             # we're running a coroutine hook with a db, so initialise an executor pool
             self.db_executor = concurrent.futures.ThreadPoolExecutor(1)
             # be sure to initialize the db in the database executor, so it will be accessible in that thread.
-            self.db = yield from self.async(self.bot.db_session)
+            self.db = yield from self.async_call(self.bot.db_session)
 
     def prepare_threaded(self):
         """
@@ -193,7 +193,7 @@ def close(self):
         if self.db is not None:
             #logger.debug("Closing database session for {}:threaded=False".format(self.hook.description))
             # be sure the close the database in the database executor, as it is only accessable in that one thread
-            yield from self.async(self.db.close)
+            yield from self.async_call(self.db.close)
             self.db = None
 
     def close_threaded(self):