Add warning to 0.2.2 changelog.
Add warning to 0.2.2 changelog.

olafurpg/scalafmt,olafurpg/scalafmt,scalameta/scalafmt,scalameta/scalafmt,Daxten/scalafmt,scalameta/scalafmt,scalameta/scalafmt,Daxten/scalafmt,olafurpg/scalafmt,olafurpg/scalafmt