Update app.py

app.py

@@ -69,7 +69,7 @@ def chat():
                     huggingfacehub_api_token=HF_TOKEN, 
                     repo_id=repo_id, 
                     model_kwargs={'temperature': 0.1, 'max_new_tokens': 1000},
-                )
+                ),
                 retriever=vector_db.as_retriever(),
                 return_source_documents=False,
                 verbose=False