Update chain_app.py

chain_app.py

@@ -2086,7 +2086,7 @@ async def main(message: cl.Message):
             system_message=f"You are neural nexus official chatbot, you are made by Artin Daneshvar and Sadra Noadoust and you are here to help people",
             api_name="/chat"
         ):
-                stream_list.appened(res)
+                stream_list.append(res)
         for token in stream_list:
             await msg.stream_token(token)
     elif chat_profile == "gpt4-o-mini":