Update Dotty and sbt-dotty versions

Author: travisbrown

build.sbt

@@ -3,7 +3,7 @@ name := "compiler-benchmark"
 version := "1.0-SNAPSHOT"
 
 def scala212 = "2.12.8"
-def dottyLatest = "0.21.0-RC1"
+def dottyLatest = "0.22.0-RC1"
 scalaVersion in ThisBuild := scala212
 val JmhConfig = config("jmh")
 

project/plugins.sbt

@@ -5,4 +5,4 @@ logLevel := Level.Warn
 addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.3.7")
 
 // sbt-dotty plugin - to support `scalaVersion := "0.x"`
-addSbtPlugin("ch.epfl.lamp" % "sbt-dotty" % "0.3.4")
+addSbtPlugin("ch.epfl.lamp" % "sbt-dotty" % "0.4.0")