Release 9.0.0

• chore: move to es6 and drop nodejs < 14 support (#53) (53c79c4)
• chore: bump aedes-persistence@9.1.2 (3a55ef4)
• chore(deps): ugrade aedes-persistence to 9.1.1 (#52) (254a26b)
• chore: update CI to Node 14, 16 and 18 (#51) (d25264d)
• fix: add types definitions and tests (#50) (60b8648)