v0.0.1-beta.2

What's Changed

• Refactor code, add plugin system to support more audio formats by @yuygfgg in #2
• rename music_library and refactor lyrics by @yuygfgg in #3
• fix typo by @yuygfgg in #4
• refactor library.py and fix bugs by @yuygfgg in #5
• add support for DATE tag by @yuygfgg in #6
• fix several bugs by @yuygfgg in #7

Full Changelog: v0.0.1-beta.1.3...v0.0.1-beta.2