update st.chat_message from response

app.py

@@ -249,6 +249,9 @@ def main():
 
         url_list = set([i.metadata['source']  for i in response['source_documents']])
         #print(f"condensed quesion : {question_generator.run({'chat_history': response['chat_history'], 'question' : query})}")
+
+        with st.chat_message("assistant"):
+            st.markdown(response['answer'])
         
         end = time.time()
         st.write("Respone time:",int(end-start),"sec")