Merge pull request #39 from SethTisue/scala-2.13.0-M3

upgrade Scala (to 2.13.0-M3) and sbt (to 0.13.17)

Author: SethTisue

build.sbt

@@ -3,7 +3,7 @@ import ScalaModulePlugin._
 version in ThisBuild := "0.1.3-SNAPSHOT"
 
 scalaVersionsByJvm in ThisBuild := {
-  val v213 = "2.13.0-M2"
+  val v213 = "2.13.0-M3"
   Map(
     8 -> List(v213 -> true),
     9 -> List(v213 -> false))

project/build.properties

@@ -1 +1 @@
-sbt.version=0.13.16
+sbt.version=0.13.17