Increment scala to 2.11.12, 2.12.4 and 2.13.0-M3

Author: ashawley

build.sbt

@@ -1,9 +1,9 @@
 import ScalaModulePlugin._
 
 scalaVersionsByJvm in ThisBuild := {
-  val v211 = "2.11.11"
-  val v212 = "2.12.3"
-  val v213 = "2.13.0-M2"
+  val v211 = "2.11.12"
+  val v212 = "2.12.4"
+  val v213 = "2.13.0-M3"
   Map(
     6 -> List(v211 -> true),
     7 -> List(v211 -> false),