Update changelog

Author: afilini

CHANGELOG.md

@@ -6,6 +6,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- Added `Wallet::get_signers()`, `Wallet::descriptor_checksum()` and `Wallet::get_address_validators()`, exposed the `AsDerived` trait.
+
 ## [v0.17.0] - [v0.16.1]
 
 - Removed default verification from `wallet::sync`. sync-time verification is added in `script_sync` and is activated by `verify` feature flag.
@@ -437,4 +439,4 @@ final transaction is created by calling `finish` on the builder.
 [v0.16.0]: https://github.com/bitcoindevkit/bdk/compare/v0.15.0...v0.16.0
 [v0.16.1]: https://github.com/bitcoindevkit/bdk/compare/v0.16.0...v0.16.1
 [v0.17.0]: https://github.com/bitcoindevkit/bdk/compare/v0.16.1...v0.17.0
-[unreleased]: https://github.com/bitcoindevkit/bdk/compare/v0.17.0...HEAD
+[unreleased]: https://github.com/bitcoindevkit/bdk/compare/v0.17.0...HEAD