Update app.py

app.py

@@ -204,7 +204,7 @@ async def chat(query,history,audience,sources,reports):
                 "question":output_query,
                 "sources":sources,
                 "docs":serialize_docs(docs),
-                "answer": history[-1]["content"],
+                "answer": history[-1].content,
                 "time": timestamp,
             }
             log_on_azure(file, logs, share_client)