need an update in Lab 2/utils/midi_utils.py

[gladys0313]

Hi guys,

Thanks a lot for this amazing work!
I noticed that there's a new release of pianoroll on Nov.4. In this new release, there's change to the argument name in the function pypianoroll.Multitrack(), specifically, "beat_resolution" has been changed to "resolution".
So correspondingly, the code Lab 2/utils/midi_utils.py line 39 should be updated.
Could you please make the change? Thank you.