Refresh vimeo duration on play

Previously, duration was only set on `loaded`, which returns 0 if the video is password protected
Fixes cookpete/react-player#514

src/players/Vimeo.js

@@ -39,11 +39,12 @@ export class Vimeo extends Component {
       }).catch(this.props.onError)
       this.player.on('loaded', () => {
         this.props.onReady()
-        this.player.getDuration().then(duration => {
-          this.duration = duration
-        })
+        this.refreshDuration()
+      })
+      this.player.on('play', () => {
+        this.props.onPlay()
+        this.refreshDuration()
       })
-      this.player.on('play', this.props.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)
@@ -56,6 +57,11 @@ export class Vimeo extends Component {
       })
     }, this.props.onError)
   }
+  refreshDuration () {
+    this.player.getDuration().then(duration => {
+      this.duration = duration
+    })
+  }
   play () {
     this.callPlayer('play')
   }