Update app.py

app.py

@@ -52,6 +52,6 @@ gr.ChatInterface(
     fill_height="True",
     submit_btn="➢",
     retry_btn="Retry",
-    undo_btn="↩ Undo"
+    undo_btn="↩ Undo",
     concurrency_limit=100,
 ).launch(show_api=False)