update packages and add valign

scripts/reveal.js/js/controllers/touch.js

@@ -1,5 +1,5 @@
-import { isAndroid } from '../utils/device.js'
-import { matches } from '../utils/util.js'
+import { isAndroid } from '../utils/device'
+import { matches } from '../utils/util'
 
 const SWIPE_THRESHOLD = 40;
 
@@ -216,6 +216,14 @@ export default class Touch {
 	 */
 	onTouchEnd( event ) {
 
+		// Media playback is only allowed as a direct result of a
+		// user interaction. Some mobile devices do not consider a
+		// 'touchmove' to be a direct user action. If this is the
+		// case, we fall back to starting playback here instead.
+		if( this.touchCaptured && !this.Reveal.slideContent.isAllowedToPlayAudio() ) {
+			this.Reveal.startEmbeddedContent( this.Reveal.getCurrentSlide() );
+		}
+
 		this.touchCaptured = false;
 
 	}