Merge pull request #103 from sullis/scala-2.12.6

Scala 2.12.6

Author: SethTisue

build.sbt

@@ -3,7 +3,7 @@ import ScalaModulePlugin._
 scalaVersionsByJvm in ThisBuild := {
   // no 2.13 for now in cross-build because of
   // https://github.com/scala/scala-java8-compat/issues/97
-  val versions = List("2.12.4", "2.11.12").map(_ -> true)
+  val versions = List("2.12.6", "2.11.12").map(_ -> true)
   Map(8 -> versions, 9 -> versions, 10 -> versions)
 }