v4.2.0

What's Changed

• migrate from karma to wtr by @keithamus in #75
• add popover polyfill by @keithamus in #73
• remove abortsignal.timeout to required section by @keithamus in #74
• add dialog-toggle-events polyfill by @keithamus in #77
• add invokers polyfill by @keithamus in #76

Full Changelog: v4.1.0...v4.2.0