https://scalacenter.github.io/scalafix/docs/rules/external-rules.html https://github.com/playframework/playframework/blob/98eed7c34ef33136cb7/documentation/manual/releases/release26/migration26/WSMigration26.md
project/scalafix.sbt
addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.12.1")sbt shell
> scalafixEnable
> scalafixAll dependency:PlayWS@com.github.xuwei-k:play-ws-scalafix:0.1.1