Rudder

Error message is:

Error:(86, 50) value mkString is not a member of java.util.stream.Stream[String]
          |  ${s.lines.dropWhile(_.trim.isEmpty).mkString("\n  ")}

We are hit but that bug and need to update to Scala 2.12.7: https://stackoverflow.com/questions/52815574/scala-12-x-and-java-11-string-lines-how-to-force-the-implicit-conversion-in-a