message: fix raf bind in IE9
diff: @@ -28,7 +28,10 @@ if (hasTransition) {
  }
  // binding to window is necessary to make hot reload work in IE in strict mode
  -const raf = (inBrowser && window.requestAnimationFrame.bind(window)) || setTimeout
  +const raf = inBrowser && window.requestAnimationFrame
  + ? window.requestAnimationFrame.bind(window)
  + : setTimeout
  +
  export function nextFrame (fn: Function) {
  raf(() => {
  raf(fn)
  