20.0.0 beta 1

What's Changed

• Remove v15-branch from checks by @mikelittle in #738
• Update yoast/phpunit-polyfills requirement from ^1.0.5 to ^2.0.1 by @dependabot in #715
• Remove final references to chassis by @mikelittle in #750
• Update johnbillion/query-monitor requirement from ^3.16.0 to ^3.16.3 by @dependabot in #758
• Upgrade wp-browser to 4.0 to get PHP8.0+ support by @mikelittle in #696
• Ensure there is a set of configuration files for the lintdocs command. by @mikelittle in #781
• Reference latest Travis module by @mikelittle in #787
• Reformat docs files after linting by @mikelittle in #786
• Create salts and keys for local and CI environments by @mikelittle in #788
• Update wp-phpunit to match WordPress version. by @mikelittle in #793

Full Changelog: 19.0.0...20.0.0-beta.1