hakimel/reveal.js 4.2.1 on GitHub

Bug fix release 🐛

Fix an issue where some slides disappeared (fully or partially) after slide transitions in Chrome (9e583b8 @hakimel)
Fix an issue that caused double-navigations and impacted presentation performance (@hakimel #3079)
Fix --host not working in npm start -- --host=0.0.0.0 (@cashcat #3075)
Fix incorrect sizing of auto-sized text in PDF exports (#2865 (comment) @hakimel)
Fix background video playback issue in some browsers by inferring MIME type from file extension (#3078 @vanch3d)