Update app.py

app.py

@@ -76,8 +76,8 @@ def respond(message, history):
             response += token
             yield response
 
-    if len(response) > char_limit:
-        response = response[:char_limit]
+    if len(response) > max_tokens:
+        response = response[:max_tokens]
 
     for punc in [".", "!", "?"]:
         i = response.rfind(punc)