Update sbt-scalajs, scalajs-compiler, ... to 1.9.0

Author: scala-steward

project/build.sbt

@@ -1,7 +1,7 @@
 // https://github.com/portable-scala/sbt-crossproject
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.0.0")
 addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "1.0.0")
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.8.0")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.9.0")
 addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.3")
 
 addSbtPlugin("com.typesafe.sbt" % "sbt-git" % "1.0.2")