v4.0.0

What's Changed

• feat: add async versions of some methods by @madkarmaa in #25
• chore: use husky by @madkarmaa in #27
• refactor!: change Ok and Err signature by @madkarmaa in #28
• chore: add type-only tests by @madkarmaa in #29

Full Changelog: v3.0.0...v4.0.0