Fix missing parameter

app.py

@@ -12,7 +12,7 @@ api_key = os.environ.get("MISTRAL_API_KEY")
 client = MistralClient(api_key=api_key)
 model = 'mistral-small'
 
-def chat_with_mistral(user_input):
+def chat_with_mistral(user_input, history):
     messages = [ChatMessage(role="user", content=user_input)]
 
     chat_response = client.chat(model=model, messages=messages)