Release v2.0.0

What's Changed

• Upgraded to Manifest V3 by @eric2788 in #35: #56 #63 #66 #40 #67 #45
• Migrated to PNPM by @eric2788 in #54
• Updated documentation (CONTRIBUTING.md, README.md, etc) @eric2788 in #65 #67

Full Changelog: https://github.com/eric2788/bilibili-vup-stream-enhancer/commits/2.0.0

Firefox user should stick on v0.12.4