[Snyk] Security upgrade reveal.js from 3.9.2 to 4.0.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json
  • package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Insecure Randomness SNYK-JS-REVEALJS-173730	Yes	No Known Exploit

Commit messages

Package name: reveal.js

The new version differs by 250 commits.

• f0b67ad 4.0.0
• 38eda3a fix livereload
• df61f9e progress bar width set via scale instead of width for perf
• 5e49cbd link fix
• 8b3f57b Merge pull request #2666 from RealCyGuy/patch-1
• 07db418 fixed links
• a1f03cb Reveal.VERSION is now available prior to initialization #2651
• feb43ff rollup cache saves 1s per js build
• 84b5298 update dependencies
• 4f22933 reveal.netlify.app -> revealjs.com
• 83151f5 Merge pull request #2651 from hakimel/dev
• 5e50136 move fonts from lib/fonts to dist/theme/fonts
• 0a58c68 move highlight themes from lib/css/ to plugin/highlight/
• 9d11927 auto-animate example in demo
• 815557c update all links to docs (will sub out '.netlify.app' once we ship 4.0)
• f618de8 restore support for markdown speaker notes
• 13f7e69 distribute /plugin
• 3d2371f bundle html inside of notes.js, no more need for relatively locating external html
• 8fc2ec9 removed phantomjs-based print-pdf plugin
• fb22716 move built plugin files from /dist/plugin/ to /plugin/<name>/
• 4e89595 readme tweaks
• c0c6b0a new copy for readme, clearer get started cta
• 1fb1e9b bigger logo
• faa4e38 new logo update readme 🥳

See the full diff

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