upgrade sbt-example

Author: Atry

project/plugins.sbt

@@ -3,3 +3,7 @@ addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.3.2")
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.16.0")
 
 addSbtPlugin("com.thoughtworks.sbt-scala-js-map" % "sbt-scala-js-map" % "4.1.1")
+
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.16.0")
+
+addSbtPlugin("com.thoughtworks.example" % "sbt-example" % "9.3.1")