Running create_movie_3D.py fails

[alexperez33]

When attempting to run create_movie_3D.py, the script fails on line 213.
fig, ax = plt.subplots(subplot_kw=dict(projection='3d'), figsize=(8, 8))
with
ValueError: Unknown projection '3d'

It appears this import fixes the problem.
from mpl_toolkits.mplot3d import Axes3D

However, I am unsure if this is the intended display/outcome.