1.0.1

Now using fixed pointycastle Blake2b:
- pointycastle: ^3.1.2
- bcgit/pc-dart#108
- Removed argon2_blake2b.dart, not necessary anymore.

1.0.0-no-null-safety

Same as v1.0.0 but without Null Safety and using pointycastle v2.0.1 (also without Null Safety).

Initial version converted from:
- https://github.com/bcgit/bc-java/blob/master/core/src/main/java/org/bouncycastle/crypto/generators/Argon2BytesGenerator.java