Merge pull request #35 from typelevel/update/nscplugin-0.4.9

Update nscplugin, sbt-scala-native, ... to 0.4.9

Author: rossabaker

project/plugins.sbt

@@ -1,5 +1,5 @@
 addSbtPlugin("org.typelevel" % "sbt-typelevel" % "0.4.17")
 addSbtPlugin("org.typelevel" % "sbt-typelevel-site" % "0.4.17")
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.10.1")
-addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.7")
+addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.9")
 addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "1.2.0")