Bar plot section update: sns.barplot in seaborn >=0.12 #13

In the "Bar Plot" section (lessons/01_python_data_visualization.ipynb, right before the first sns.barplot(x=count.index, y=count.values) cell), the notebook text says: Note that seaborn automatically color-code the continent, assigning each one a unique color.
This was true in older seaborn versions, but as of seaborn 0.12 (version that would be automatically installed through requirements.txt), barplot() no longer implicitly assigns a different color per category when only x/y are passed.