v0.20.1

MLJBase v0.20.1

Diff since v0.20.0

Closed issues:

• For a 0.20 release (#725)
• How to transform any deterministic regression model to a probabilistic binary classification model, and then evaluate it with k-fold cross validation (#760)

Merged pull requests:

• Fix wrong field name in a show method (#758) (@rikhuijzer)
• For a 0.20.1 release (#761) (@ablaom)