Update app.py

app.py

@@ -98,7 +98,7 @@ def qa_bot(query):
   response_df.rename(columns = {'query' : 'Question','result' : 'Answer'},inplace = True)
   history_df = pd.concat([history_df,response_df])
   history_df.reset_index(drop = True,inplace = True)
-  history_df.to_excel('./responses.xlsx')
+  history_df.to_csv('./responses.csv')
   print(history_df)
   return (response['result'])