v0.5.1

Please see the 0.5.1 release notes for more!

• Add density mark. #943 #948 #954 #958
• Add linear regression marks. #945
• Add Delaunay and Voronoi marks. #917 #931
• Add scale.interval option. #849
• Add mark pointerEvents option. #917
• The frame mark now supports the rx and ry options for rounded corners. #951
• The cell mark now respects the dx and dy options for offsets. #956
• Fix a bug where arrow heads would not render correctly when the strokeWidth was exactly one. #922 #923
• Fix the scale.zero option when the domain is negative. #934
• Fix the clip mark option when x or y is a band scale. #950
• Fix the fill color of text marks using the href option. #940
• Fix a crash in the bar and tick mark when the associated band scale is not present. #939
• Use element.appendChild instead of element.append for better compatibility. Thanks, @jkenzer! #953 #957
• Improve the error message when the facet option is used without data. #938
• Throw an error if initializers attempt to create position scales. #939
• Throw an error if an implicit ordinal position domain has more than 10,000 values. #858