v2.0.0

What's Changed

• Dodaj blokady mutex do funkcji w klasie Database (#84) by @ddnowicki in #85
• repair server crash while empty post by @ddnowicki in #86
• Feature/bb2 65 tests in database by @TStypulkowski in #87
• Feature/bb2 48 merging separating receipts by @KuWojtow in #88
• Fixes for #89 by @ddnowicki in #90
• merging and unmerging endpoints & repair server crash by @ddnowicki and @KuWojtow in #89

Full Changelog: v1.0.0...v2.0.0