Update app.py

app.py

@@ -108,7 +108,7 @@ def initialize_llmchain(vector_db):
     retriever=vector_db.as_retriever()
     memory = ConversationBufferMemory(memory_key="chat_history", output_key='answer', return_messages=True)
     qa_chain = ConversationalRetrievalChain.from_llm(llm,retriever=retriever,chain_type="stuff", 
-                                                         memory=memory,return_source_documents=True,verbose=False,)
+                                                         memory=memory,return_source_documents=True,verbose=False)
         
     return qa_chain