Update app.py

app.py

@@ -7,7 +7,7 @@ def yes_man(message, history):
     #    return "Ask me anything!"
     
     import requests
-    headers = {"Authorization": f"Bearer {API_TOKEN}"}
+    headers = {"Authorization": f"Bearer {HF_TOKEN}"}
     API_URL = "https://api-inference.huggingface.co/models/gpt2"
     def query(payload):
       response = requests.post(API_URL, headers=headers, json=payload)