minor fixes

src/quickbot/main.py

@@ -85,7 +85,9 @@ class QBotApp(Generic[UserType, ConfigType], FastAPI):
 
             user_class = DefaultUser
 
-        self.allowed_updates = allowed_updates or ["message", "callback_query"]
+        self.allowed_updates = list(
+            (set(allowed_updates or [])).union({"message", "callback_query"})
+        )
 
         self.user_class = user_class
         self.entity_metadata: EntityMetadata = user_class.entity_metadata