aka "Bayesian Methods for Hackers": An introduction to Bayesian methods + probabilistic programming with a computation/understanding-first, mathematics-second point of view. All in pure Python ;)
I ran into this today as well. Would need to be fixed throughout all the chapters, and would probably need to bump requirements.txt to enforce the matplotlib version where this switch happens.
Normed has been deprecated and now throws an error - https://matplotlib.org/3.1.1/api/_as_gen/matplotlib.pyplot.hist.html