project/plugins.sbt (4 lines of code) (raw):
resolvers += Resolver.typesafeRepo("releases")
addSbtPlugin("com.gu" % "sbt-riffraff-artifact" % "1.1.18")
addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.2")
addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.3.0")