Transition to StatisticalMeasures.jl

[ablaom]

MLJBase is a dep of this pkg. But since MLJBase 1.0, the measures API lives in StatisticalMeasures.jl. To help this package make the transition the following may be helpful:

migration guide

[ashryaagr]

Unfortunately, I do not have the bandwidth to maintain Fairness.jl along with my other commitments.
But when I have more bandwidth, I will try to migrate the codebase.