message: add bench task
diff: @@ -3,6 +3,7 @@ organization := "org.enso"
  scalaVersion := "2.12.8"
  lazy val Benchmark = config("bench") extend Test
  +lazy val bench = taskKey[Unit]("Run Benchmarks")
  lazy val enso = (project in file(".")).aggregate(syntax)
  @@ -31,3 +32,6 @@ lazy val syntax = (project in file("syntax"))
  )
  .settings(SbtJFlexPlugin.jflexSettings)
  .settings(mainClass in (Compile,run) := Some("org.enso.syntax.Main"))
  + .settings(bench := {
  + (test in Benchmark).value
  + })
  \ No newline at end of file
  