Merge pull request #222 from scala-steward/update/sbt-scalajs-1.5.1

Update sbt-scalajs, scalajs-compiler, ... to 1.5.1

Author: rossabaker

project/plugins.sbt

@@ -2,5 +2,5 @@ addSbtPlugin("org.tpolecat" % "tut-plugin" % "0.6.13")
 addSbtPlugin("com.47deg" % "sbt-microsites" % "0.9.7")
 addSbtPlugin("com.typesafe.sbt" % "sbt-ghpages" % "0.6.3")
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.0.0")
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.5.0")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.5.1")
 addSbtPlugin("com.codecommit" % "sbt-spiewak-sonatype" % "0.20.4")