release 0.4.0

What's Changed

• 리팩토링: Picker 컴포넌트 유연성 개선 및 샘플 앱 적용 by @kez-lab in #13
• 라이브러리 깃헙 액션 배포 추가 by @kez-lab in #14
• chore: Update compileSdk and dependencies to latest versions by @kez-lab in #15
• Feature/sample redesign by @kez-lab in #16

Full Changelog: 0.3.0...0.4.0