Update app.py

app.py

@@ -157,7 +157,7 @@ if prompt := st.chat_input(f"Hi I'm {selected_model}, ask me a question"):
     with st.chat_message("assistant"):
         client = InferenceClient(
             model=model_links[selected_model],
-            headers)
+            headers=headers)
 
         output = client.text_generation(
             messages=[