Increment scala compiler to 2.12.3 and 2.13.0-M2

Author: ashawley

build.sbt

@@ -2,8 +2,8 @@ import ScalaModulePlugin._
 
 scalaVersionsByJvm in ThisBuild := {
   val v211 = "2.11.11"
-  val v212 = "2.12.2"
-  val v213 = "2.13.0-M1"
+  val v212 = "2.12.3"
+  val v213 = "2.13.0-M2"
   Map(
     6 -> List(v211 -> true),
     7 -> List(v211 -> false),