Fix Vimeo duration logic

Fixes cookpete/react-player#250

src/players/Vimeo.js

@@ -13,6 +13,9 @@ export default class Vimeo extends Base {
   static canPlay (url) {
     return MATCH_URL.test(url)
   }
+  duration = null
+  currentTime = null
+  secondsLoaded = null
   componentDidMount () {
     const { url, config } = this.props
     if (!url && config.vimeo.preload) {
@@ -43,12 +46,12 @@ export default class Vimeo extends Base {
         const iframe = this.container.querySelector('iframe')
         iframe.style.width = '100%'
         iframe.style.height = '100%'
+        this.player.getDuration().then(duration => {
+          this.duration = duration
+        })
       }).catch(this.props.onError)
       this.player.on('loaded', this.onReady)
-      this.player.on('play', ({ duration }) => {
-        this.duration = duration
-        this.onPlay()
-      })
+      this.player.on('play', this.onPlay)
       this.player.on('pause', this.props.onPause)
       this.player.on('seeked', e => this.props.onSeek(e.seconds))
       this.player.on('ended', this.props.onEnded)