mwaskom/seaborn: v0.12.0a1

This is the second alpha release for seaborn v0.12. Changes in this release include: Objects interface Add Norm move, for divisive scaling after stat computation (#2827) Complete Line mark and add corresponding Path, Lines, and Paths marks (#2822) Fix inferred y orientation with computed x variable (#2818) Fix multiple moves while pairing (#2817) Improve missing data handling (#2816) Categorical plots Revert change to 1D "wide" data handling introduced in v0.12.0a0 (#2829) Improve legend fore new features in categorical scatterplots (#2828) Fix inner boxes with unpaired split violins (#2814) Distribution plots Fix some edgecases in histplotwhen specifying binwidth (#2813) Fix histplot/kdeplot normalization when using hue and weights (#2812)