I think FileReader in lib.scala is wrong

MDN reference
https://developer.mozilla.org/en-US/docs/Web/API/FileReader
W3C reference
http://www.w3.org/TR/FileAPI/#dfn-filereader

I also did use it here 
https://github.com/hussachai/play-scalajs/blob/master/scalajs/src/main/scala/example/ScalaJSFileUpload.scala

Thanks