nuScenes-Lyft Qualitative.ipynb plotting correction

[elsoroka]

Thanks for publishing such a well documented package!

A minor error in the demo: When I tried to run nuScenes-Lyft Qualitative.ipynb, the line ell = patches.Ellipse(mean, v[0], v[1], 180. + angle, color=color) didn't run.
It should be ell = patches.Ellipse(mean, v[0], v[1], angle=180. + angle, color=color) in the last couple versions of matplotlib

[elsoroka]

I am sorry...I meant to open this issue in https://github.com/NVlabs/adaptive-prediction where the notebook is (I had both pages open). Not sure if it can be moved.