add playsInline option

docs/assets/example/index.js

@@ -22,13 +22,12 @@ var art = new Artplayer({
     miniProgressBar: true,
     mutex: true,
     backdrop: true,
+    playsInline: true,
     theme: '#23ade5',
     lang: navigator.language.toLowerCase(),
     whitelist: ['*'],
     moreVideoAttr: {
         crossOrigin: 'anonymous',
-        playsInline: true,
-        'webkit-playsinline': true,
         'x5-video-player-type': 'h5',
         'x5-video-player-fullscreen': false,
         'x5-video-orientation': 'portraint',