Add blake2b_hash to targets

Crystal 1.0.0 support

Release 1.2.1

Release 1.2.0

Release 1.1.1

Fix Crystal 0.31 warnings.

Release 1.1.0

Sodium::Cipher::Aead::Xchacha20Poly1305Ietf
	New recommended AEAD algorithm.
Sodium::Password
	Create keys based on a time cost.
	Hashing and Key derivation split in to separate classes.
Sodium::*::PublicKey
	JSON and Yaml converters.
Sodium::Cipher::Chalsa
	Add #random_bytes for use as a CSPRNG.
Sodium::Nonce
	Reuse detection.
Sodium::SecureBuffer
	State transitions with exceptions instead of crashes.
Sodium::Kdf
	Use SecureBuffer to keep key unreadable until used.

SecureBuffer uniformly used in most key holding classes with erase param.

More documentation.
More benchmarks.
More specs.

Release 1.0.1

Release 1.0.0

Add Documentation.