v5.7.2

Re-release of v5.7.1 as v6.0.0-alpha.3 was accidentally published as latest.

• 📖 Doc update to include Spectacle Codemirror as a newly available extension. Thanks @jonathan-fielding!
• 🔧 Dependency updates to, among other things, allow for use of React Hooks in your presentations
• 🐛 Smol bug fix for the transitionDuration prop. Thanks @narinluangrath!