Add -i flag to CLI to write output into file.
Add -i flag to CLI to write output into file.

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