Merge pull request #44 from http4s/update/nscplugin-0.4.9

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

Author: ybasket

project/plugins.sbt

@@ -1,6 +1,6 @@
 addSbtPlugin("org.http4s" % "sbt-http4s-org" % "0.14.9")
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.11.0")
-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")
 // Fix links to API docs of scala-xml
 addSbtPlugin("com.thoughtworks.sbt-api-mappings" % "sbt-api-mappings" % "3.0.2")