Merge pull request #384 from typelevel/scala-js-1.4

Downgrade to scala.js-1.4.0

Author: rossabaker

project/plugins.sbt

@@ -2,7 +2,7 @@ addSbtPlugin("io.github.davidgregory084" % "sbt-tpolecat" % "0.3.1")
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.1.0")
 
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.2.0")
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.10.0")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.4.0")
 addSbtPlugin("com.github.cb372" % "sbt-explicit-dependencies" % "0.2.16")
 addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.5.10")
 addSbtPlugin("ch.epfl.lamp" % "sbt-dotty" % "0.5.5")