Merge pull request #350 from scala-steward/update/sbt-dotty-0.3.4

Update sbt-dotty to 0.3.4

Author: ashawley

project/plugins.sbt

@@ -6,4 +6,4 @@ val scalaJSVersion =
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % scalaJSVersion)
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "0.6.1")
 addSbtPlugin("org.scala-lang.modules" % "sbt-scala-module" % "2.0.0")
-addSbtPlugin("ch.epfl.lamp" % "sbt-dotty" % "0.3.3")
+addSbtPlugin("ch.epfl.lamp" % "sbt-dotty" % "0.3.4")