blake2: expand changelog (#331)

blake2/CHANGELOG.md

@@ -8,6 +8,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## 0.10.0 (2021-12-07)
 ### Changed
 - Update to `digest` v0.10 and remove dependency on `crypto-mac` ([#217])
+- `Blake2b` and `Blake2s` renamed into `Blake2b512` and `Blake2s256` respectively.
+  New `Blake2b` and `Blake2s` are generic over output size. `VarBlake2b` and `VarBlake2s`
+  renamed into `Blake2bVar` and `Blake2sVar` respectively. ([#217])
+
+### Removed
+- `Blake2b` and `Blake2s` no longer support MAC functionality. ([#217])
+
+### Added
+- Separate `Blake2bMac` and `Blake2sMac` types generic over output size and `Blake2bMac512`
+  and `Blake2sMac256` type aliases around them. ([#217])
 
 [#217]: https://github.com/RustCrypto/hashes/pull/217