Don't publish root aggregate in generated project (#588)

Author: neko-kai

idealingua-v1/idealingua-v1-transpilers/src/main/scala/izumi/idealingua/translator/toscala/layout/ScalaLayouter.scala

@@ -72,7 +72,8 @@ class ScalaLayouter(options: ScalaTranslatorOptions) extends TranslationLayouter
         val rootSettings =
           if (options.manifest.sbt.isCrossBuild) {
             s""".settings(
-               |   crossScalaVersions := Nil
+               |   crossScalaVersions := Nil,
+               |   publish / skip := true
                |)""".stripMargin
           } else ""