v0.3.2

Cross-build for 2.13.6.

Note that this is the last release for Scala 2.12.10, 2.13.1-3, 3.0.0-M3 and 3.0.0-RC{1,2,3}. From now on, we'll be publishing releases for the latest 3 versions of each series (2.12, 2.13, 3).