Add new module for Scala2 libraries

Author: Matteo Di Pirro

build.sbt

@@ -284,6 +284,17 @@ lazy val scala_libraries_3 = (project in file("scala-libraries-3"))
     libraryDependencies += "com.lihaoyi" %% "os-lib" % "0.8.1"
   )
 
+lazy val scala_libraries_4 = (project in file("scala-libraries-4"))
+  .settings(
+    name := "scala-libraries",
+    libraryDependencies += "org.scalatest" %% "scalatest" % "3.1.2" % Test,
+    libraryDependencies ++= Seq(
+      "org.scala-lang.modules" %% "scala-async" % "1.0.1",
+      "org.scala-lang" % "scala-reflect" % scalaVersion.value % Provided
+    ),
+    scalacOptions += "-Xasync"
+  )
+
 lazy val scala_strings = (project in file("scala-strings"))
   .settings(
     name := "scala-strings",