5.0.0

This is a complete overhaul of the plugin, based on extensive feedback and testing in screen readers. Some breaking changes have been made to improve the defaults. If you haven't customized the plugin options, it's safe to upgrade, otherwise please consult the readme.

• Rethink announcements: use assertive live region and announce after a delay (@ScoobyDid)
• Focus body on navigation instead of main
• Only use h1 for announcements by default, ignore h2
• Disable animations by default if users prefer reduced motion
• Correctly exclude inert elements from autofocus
• Tested in VoiceOver, JAWS and NVDA