Update to last reveal.js 4.2.1 (#148)

diff --git a/inst/reveal.js-4.2.1/test/test-auto-animate.html b/inst/reveal.js-4.2.1/test/test-auto-animate.html
new file mode 100644
index 0000000..4c8463e
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+++ b/inst/reveal.js-4.2.1/test/test-auto-animate.html
@@ -0,0 +1,166 @@
+<!doctype html>
+<html lang="en">
+
+	<head>
+		<meta charset="utf-8">
+
+		<title>reveal.js - Test Auto-Animate</title>
+
+		<link rel="stylesheet" href="../dist/reveal.css">
+		<link rel="stylesheet" href="../node_modules/qunit/qunit/qunit.css">
+		<script src="../node_modules/qunit/qunit/qunit.js"></script>
+	</head>
+
+	<body style="overflow: auto;">
+
+		<div id="qunit"></div>
+		<div id="qunit-fixture"></div>
+
+		<div class="reveal">
+
+			<div class="slides">
+
+				<section data-auto-animate>
+					<h1>h1</h1>
+					<h2>h2</h2>
+					<h3 style="position: absolute; left: 0;">h3</h3>
+				</section>
+
+				<section data-auto-animate>
+					<h1 data-auto-animate-duration="0.1">h1</h1>
+					<h2 style="opacity: 0;">h2</h2>
+					<h3 style="position: absolute; left: 100px;">h3</h3>
+				</section>
+
+				<section data-auto-animate data-auto-animate-duration="0.1">
+					<h1>h1</h1>
+					<h2>h2</h2>
+					<h3>h3</h3>
+				</section>
+
+				<section>
+					<h1>Non-auto-animate slide</h1>
+				</section>
+
+				<section data-auto-animate>
+					<h1 class="fragment">h1</h1>
+					<h2 class="fragment">h2</h2>
+					<h3>h3</h3>
+				</section>
+
+				<section data-auto-animate>
+					<h1 class="fragment">h1</h1>
+					<h2 class="fragment">h2</h2>
+					<h3 class="fragment">h3</h3>
+				</section>
+
+				<section>
+					<h1>Non-auto-animate slide</h1>
+				</section>
+
+			</div>
+
+		</div>
+
+		<script src="../dist/reveal.js"></script>
+		<script>
+
+			QUnit.config.reorder = false;
+
+			const slides = Array.prototype.map.call( document.querySelectorAll( '.slides section' ), slide => {
+				return {
+					slide: slide,
+					h1: slide.querySelector( 'h1' ),
+					h2: slide.querySelector( 'h2' ),
+					h3: slide.querySelector( 'h3' )
+				};
+			} );
+
+			Reveal.initialize().then( async () => {
+
+				QUnit.module( 'Auto-Animate' );
+
+				QUnit.test( 'Adds data-auto-animate-target', assert => {
+					Reveal.slide(1);
+					assert.strictEqual( slides[0].h1.getAttribute( 'data-auto-animate-target' ), '', 'From elements have blank data-auto-animate-target' );
+					assert.ok( slides[1].h1.getAttribute( 'data-auto-animate-target' ).length > 0, 'To elements have a data-auto-animate-target value' );
+				});
+
+				QUnit.test( 'Ends on correct target styles', assert => {
+					Reveal.slide(1);
+					assert.strictEqual( slides[1].h2.style.opacity, "0" );
+					assert.strictEqual( slides[1].h3.offsetLeft, 100 );
+				});
+
+				QUnit.test( 'Does not add [data-auto-animate] on non auto-animated slides', assert => {
+					Reveal.slide(2);
+					Reveal.next();
+					assert.ok( slides[3].slide.hasAttribute( 'data-auto-animate' ) === false )
+				});
+
+				QUnit.test( 'autoAnimate config option', assert => {
+					Reveal.configure({ autoAnimate: false });
+
+					assert.ok( document.querySelectorAll( 'data-auto-animate-target' ).length === 0, 'Removes all [data-auto-animate-target]' )
+					assert.ok( Array.prototype.every.call( document.querySelectorAll( 'section[data-auto-animate]' ), el => {
+						return el.dataset.autoAnimate === '';
+					}, 'All data-auto-animate attributes are reset' ) );
+
+					Reveal.configure({ autoAnimate: true });
+				});
+
+				QUnit.test( 'Carries forward matching fragment visibility', assert => {
+					Reveal.slide(4);
+					assert.ok( !slides[5].h1.classList.contains( 'visible' ) )
+					Reveal.next();
+					Reveal.next();
+					Reveal.next();
+					assert.ok( slides[5].h1.classList.contains( 'visible' ) )
+					assert.ok( slides[5].h2.classList.contains( 'visible' ) )
+					assert.ok( !slides[5].h3.classList.contains( 'visible' ) )
+					Reveal.next();
+					assert.ok( slides[5].h3.classList.contains( 'visible' ) )
+					Reveal.next();
+					assert.ok( slides[6].slide === Reveal.getCurrentSlide() )
+				});
+
+				QUnit.test( 'Slide specific data-auto-animate-duration', assert => {
+					assert.timeout( 400 );
+					assert.expect( 1 );
+
+					return new Promise( resolve => {
+						let callback = () => {
+							slides[2].h3.removeEventListener( 'transitionend', callback );
+							assert.ok( true, 'Transition ended within time window' );
+							resolve();
+						}
+
+						Reveal.slide(1);
+						Reveal.slide(2);
+
+						slides[2].h3.addEventListener( 'transitionend', callback );
+					} );
+				});
+
+				// QUnit.test( 'Element specific data-auto-animate-duration', assert => {
+				// 	assert.timeout( 400 );
+				// 	assert.expect( 1 );
+
+				// 	return new Promise( resolve => {
+				// 		let callback = () => {
+				// 			slides[1].h1.removeEventListener( 'transitionend', callback );
+				// 			assert.ok( true, 'Transition ended within time window' );
+				// 			resolve()
+				// 		}
+
+
+				// 		Reveal.slide(1);
+				// 		slides[1].h1.addEventListener( 'transitionend', callback );
+				// 	} );
+				// });
+
+			} );
+		</script>
+
+	</body>
+</html>