Update app.py

app.py

@@ -198,7 +198,7 @@ if __name__ == "__main__":
                     "Midi event transformer for music generation\n\n"
                     "Demo for [SkyTNT/midi-model](https://github.com/SkyTNT/midi-model)\n\n"
                     "[Open In Colab]"
-                    "(https://colab.research.google.com/drive/1x0iZkVakn3VBouIMXuzQ2OFhqYiAA3UE?usp=sharing)"
+                    "(https://colab.research.google.com/github/SkyTNT/midi-model/blob/main/demo.ipynb)"
                     " for faster running")
 
         tab_select = gr.Variable(value=0)