v0.4.2

Please see the 0.4.2 release notes for more!

• Add box mark for generating box plots. #777
• Add improved shorthand for bar, vector, area, line, rect, and other marks. #782 #785 #786 #787
• Add width and length derived channels to sort options. #770
• Add fallback from y to y2 and x to x2 to sort options. #770
• Add x and y reducers for the bin transform. #771
• Add percentile reducers (e.g., p95) to the bin, group, and window transforms. #776
• Fix the implicit z channel cardinality test to be less strict. #774
• Fix the ticks option to generate no ticks when null. #781
• Fix the tickFormat option to generate no tick labels when null. #781
• Fix emoji warning rendering in Chrome. ⚠️ #788
• Document the scope reducer option. #784