Fix python 3.8.3

main.py

@@ -71,7 +71,7 @@ def replication_task():
     while True:
         print()
         conn = db.connect_db()
-        with (Session(conn) as session):
+        with Session(conn) as session:
             for bndname in connected:
                 for item in session.query(db.Queue).join(db.Queue.user).filter_by(bndname=bndname).all():
                     if item.user.is_active_now():