Merge pull request #348 from kailuowang/patch-1

upgrade scalajs to 0.6.19

Author: rickynils

project/plugin.sbt

@@ -2,6 +2,6 @@ addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "0.1.14")
 
 addSbtPlugin("com.jsuereth" % "sbt-pgp" % "1.0.0")
 
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "0.6.17")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "0.6.19")
 
 scalacOptions += "-deprecation"