Update build.sbt

Author: kapkaev

build.sbt

@@ -2,7 +2,7 @@ lazy val commonSettings = Seq(
   organization := "com.whisk",
   version := "0.9.9",
   scalaVersion := "2.13.0",
-  crossScalaVersions := Seq("2.13.0", "2.12.3", "2.11.11"),
+  crossScalaVersions := Seq("2.13.0", "2.12.8", "2.11.12"),
   scalacOptions ++= Seq("-feature", "-deprecation"),
   fork in Test := true,
   licenses += ("MIT", url("http://opensource.org/licenses/MIT")),