0.8.1 Add Gen.chooseGen_: Gen[A] Add Distributive[Gen] instance. Upgrade Monocle to 1.3.2. Upgrade Scala.JS to 0.6.13. Upgrade Scalaz to 7.2.7. Upgrade SBT to 0.13.13. Use kind-projector. Publish for Scala 2.12.0.