Release 2.4.0

• new feature added (95e657c)
• new feature added (c22cbd7)
• encrypt/decrypt file method also added (ac0101e)
• encrypt/decrypt file method also added (f09c9d2)
• chore: release 2.2.0 (c0d53ff)
• ios crash fixed (6e5eff2)
• chore: release 2.1.2 (d526626)
• chore: release 2.1.1 (30d6664)
• package.json updated (8218d12)