v0.15.0

See
https://github.com/tabkit/tabkit2/blob/master/CHANGELOG.md#0150---2021-12-13

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What's Changed

• Switch from Flow to TypeScript by @PikachuEXE in #192
• Implement close button visibility by @PikachuEXE in #198
• Workaround tab disappearing issue by @PikachuEXE in #210
• Update text for preference panel by @PikachuEXE in #200

New Contributors

• @dependabot made their first contribution in #153

Full Changelog: v0.14.0...v0.15.0