Update app.py

app.py

@@ -8,7 +8,7 @@ def respond(message, history):
     messages= [{"role": "system", "content":"You are a friendly chatbot"}]
     if history:
         messages.extend(history)
-    messages.append[{"role": "user", "content": message}]
+    messages.append({"role": "user", "content": message})
 
     response = client.chat_completion (
         messages,