v2.0.0+66

What's Changed

• Bloc 패턴 - Data Layer 리팩터링 by @w8385 in #49
• [Refactor] 1차 리팩토링 by @jayden000106 in #50
• [Feat] 사용자 목록 가져오기 by @w8385 in #51
• refactor: contest notification by @w8385 in #53

Full Changelog: v1.1.6+61...v2.0.0+66