### Changed
- Internal implementation by removing unnecessary buffering ([#849])
- `Rate: BlockSizes` generic parameter to `const RATE: usize` ([#849])

### Removed
- Implementations of `BlockSizeUser` ([#856])

[#849]: https://github.com/RustCrypto/hashes/pull/849
[#856]: https://github.com/RustCrypto/hashes/pull/856