Cats 2.0.0-M4 is a milestone release for Cats 2.0 that's available on Scala 2.11, 2.12, 2.13.0 and Scala.js 0.6.
Cats 2.0.0-M4 (like the upcoming 2.0.0 release) maintains binary compatibility with Cats 1.x.x in the cats-kernel, cats-core and cats-free modules, but not cats-laws, cats-kernel-laws, cats-testkit, or alleycats.
2 documentation additions/fixes
- #2868 mention cats by example by @TomTriple
- #2860 Remove index.md from post-release process by @rossabaker