v0.7.1

v0.7.1 (2019-10-06)

Diff since v0.7.0

Closed issues:

• Can not sort CategoricalVector (#215)
• Broadcasting methods over CategoricalString has changed (#199)
• Abstraction for AbstractString and Number (#186)

Merged pull requests:

• Add optimized method for broacasting ismissing (#218) (nalimilan)
• Use levels from DataAPI (#216) (nalimilan)
• Fix convert with Union{T, Nothing} (#213) (nalimilan)