3.7.0

Added

• Destroyable implementation for Account
• equal and hashCode methods for Account

Changed

• From now on Account is always a complete keypair with a private key.
  To verify signatures use Account.verifySignature static methods
• Updated XDR version to 7708446fd03153bf0d99b299c9df054dd9788c7c
• Updated Kotlin version to 1.4.10

Fixed

• Inability to convert true UInt64 amounts from and to precised

Removed

• Positive number restriction on transaction salt
• canSign method from Account (see above)
• Account.fromAccountId and Account.fromPublicKey methods (see above)