v2.0.0: cats/cats-effect 2.2.0, cats-mtl 1.x, Scala.js 1.x

What’s Changed

• Update sbt-mima-plugin to 0.8.1 (#239) @scala-steward
• Update sbt-scalajs, scalajs-compiler to 1.3.0 (#236) @scala-steward
• Update all GH actions to latest versions (#238) @cb372
• Update sbt-buildinfo to 0.10.0 (#223) @scala-steward
• Update sbt-scalafmt to 2.4.2 (#220) @scala-steward
• Update libraries (cats, cats-effect, cats-mtl, scalatest), drop Scala 2.11 support (#229) @iRevive
• Update sbt to 1.4.0 (#233) @scala-steward
• Update sbt to 1.3.13 (#214) @scala-steward
• Update scalacheck-1-14 to 3.2.0.0 (#212) @scala-steward
• Update scalatest to 3.2.0 (#211) @scala-steward

Breaking changes

• We now publish artifacts for Scala.js 1.x, not 0.6.x.
• The cats-mtl integration module now depends on cats-mtl 1.x, not 0.7.x. This introduces a bunch of breaking changes within that module, e.g. cats-mtl's ApplicativeHandle is now called Handle.