1.3.0

Fixed Branca implementation by switching to libsodium (Bouncy Castle is not ready for XChaCha-Poly1305). This makes this implementation incompatible with other implementations that use Bouncy Castle (the Java implementations).

The initial version of this .NET Branca implementation was a port of the Java Branca libraries. I have since found out that these do not conform to the Branca specification and have updated my .NET Branca library accordingly.