Update changelog for 0.9.0 release

Author: thunderbiscuit

CHANGELOG.md

@@ -6,6 +6,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [v0.9.0]
 - Breaking Changes
   - Rename `get_network()` method on `Wallet` interface to `network()` [#185]
   - Rename `get_transactions()` method on `Wallet` interface to `list_transactions()` [#185]
@@ -100,7 +101,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [v0.2.0]
 
-[unreleased]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.8.0...HEAD
+[unreleased]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.9.0...HEAD
+[v0.9.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.8.0...v0.9.0
 [v0.8.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.7.0...v0.8.0
 [v0.7.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.6.0...v0.7.0
 [v0.6.0]: https://github.com/bitcoindevkit/bdk-ffi/compare/v0.5.0...v0.6.0