Update to reveal.js 4.6.1
Change-Id: I566737c50b93dd8c094ad3c3fa59865260b3b4ba
diff --git a/inst/reveal.js-4.6.1/js/utils/device.js b/inst/reveal.js-4.6.1/js/utils/device.js
new file mode 100644
index 0000000..f2bce20
--- /dev/null
+++ b/inst/reveal.js-4.6.1/js/utils/device.js
@@ -0,0 +1,8 @@
+const UA = navigator.userAgent;
+
+export const isMobile = /(iphone|ipod|ipad|android)/gi.test( UA ) ||
+ ( navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1 ); // iPadOS
+
+export const isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );
+
+export const isAndroid = /android/gi.test( UA );
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