Merge pull request #751 from typelevel/update/auxlib-0.5.9

Update auxlib, clib, javalib, nativelib, ... to 0.5.9

Author: mergify[bot]

project/plugins.sbt

@@ -1,5 +1,5 @@
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.20.1")
-addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.5.8")
+addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.5.9")
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.3.2")
 addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "1.3.2")
 addSbtPlugin("com.thoughtworks.sbt-api-mappings" % "sbt-api-mappings" % "3.0.2")