Plot legend update

Seaborn updated the way it internally handles plot legends. This update makes sure that plot legends still display as desired in light of that change.

Built-in plotting and data manipulation functions

This major release introduces built-in plotting and data manipulation functions. The plotting functions wrap Seaborn lineplots, including a function to have two differently scaled y axes on either side of a plot. The data manipulation functions can select the top countries with the most counts, calculate rolling means, calculate daily change in cumulative counts, and calculate the days since a certain number of counts for all countries.

This release includes new tutorials that show how to use these new features. Tutorial 1 gives a preview of what is possible with these functions. Tutorials 2-4 go in-depth on how to use them.

JHU and NYT data; plotting tutorials

This release provides functions for accessing data from both Johns Hopkins and The New York Times. The docs folder includes tutorials on how to use these functions, and how to plot the data.