0.6.0 is here!

[05nelsonm]

• APIs in KotlinCrypto/core are now finalized for Digest, Mac and Xof abstractions; constructors no longer require an opt-in to InternalKotlinCryptoApi.
• BLAKE2b and BLAKE2s are now available as Digest from KotlinCrypto/hash, and as Mac from KotlinCrypto/MACs for keyed hashing functionality.
• KotlinCrypto/endians library functionality has been replaced by KotlinCrypto/bitops; check it out!