### Changed
- Internal implementation by removing unnecessary buffering ([#849])
- Serialization format used by `SerializableState` trait implementations
([#849])

### Removed
- `Shake`, `Shake128`, and `Shake256` types (moved to the `shake` crate)
([#869])

[#849]: https://github.com/RustCrypto/hashes/pull/849
[#869]: https://github.com/RustCrypto/hashes/pull/869