v0.8.3

CategoricalArrays v0.8.3

Diff since v0.8.2

Closed issues:

• Working with missing values (#298)
• Conversion to CategorialVector{Union{T, Missing}} is broken in 0.8.2 (#299)

Merged pull requests:

• Improve handling of missing values in cut (#300) (@nalimilan)
• Add canonical URL to manual (#301) (@nalimilan)
• Fix convert ambiguity between categorical vectors/matrices (#302) (@nalimilan)
• Implement DataAPI's refarray/refvalue/refpool interface (#303) (@nalimilan)