Merge pull request #221 from scala-steward/update/sbt-scalajs-crossproject-1.2.0

Update sbt-scalajs-crossproject to 1.2.0

Author: armanbilge

core/build.sbt

@@ -1,3 +1,3 @@
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.6")
 addSbtPlugin("de.heikoseeberger" % "sbt-header" % "5.6.0")
-addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.1.0")
+addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.2.0")