Update CHANGELOG.md

Co-authored-by: Dr. Maxim Orlovsky <orlovsky@pandoracore.com>

CHANGELOG.md

@@ -7,6 +7,8 @@
 - Add methods to `Block` [to get the coinbase tx and BIP34 height commitment](https://github.com/rust-bitcoin/rust-bitcoin/pull/444)
 - [Add `extend` method](https://github.com/rust-bitcoin/rust-bitcoin/pull/459) to bip32::DerivationPath
 - [Alias `(Fingerprint, DerivationPath)` as `KeySource`](https://github.com/rust-bitcoin/rust-bitcoin/pull/480)
+- [Add serde implementation for PSBT data structs](https://github.com/rust-bitcoin/rust-bitcoin/pull/497)
+- [Add FromStr/Display implementation for SigHashType](https://github.com/rust-bitcoin/rust-bitcoin/pull/497/commits/a4a7035a947998c8d0d69dab206e97253fd8e048)
 - Expose [the raw sighash message](https://github.com/rust-bitcoin/rust-bitcoin/pull/485) from sighash computations
 
 # 0.25.0 - 2020-09-10
@@ -219,4 +221,3 @@ See `Transaction::verify` and `Script::verify` methods.
 
 * Remove `num` dependency at Matt's request; agree this is obnoxious to require all
 downstream users to also have a `num` dependency just so they can use `Uint256::from_u64`.
-