Update app.py

app.py

@@ -157,7 +157,7 @@ def greet(appid, api_secret, api_key, topic, answer):
     score(appid=appid,
          api_secret=api_secret,  
          api_key=api_key,  
-         gpt_url="ws://spark-api.xf-yun.com/v3.1/chat",
+         gpt_url="ws://spark-api.xf-yun.com/v2.1/chat",
          question=question)
     with open('output.txt', 'r') as f:
         opinions = f.read()