chore: Add CHANGELOG.md

Author: ValuedMammal

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [unreleased]
+
+
+## [0.2.0]
+
+### Added
+
+- feat: Added `FeeStrategy` enum which defines the fee target as either a feerate or fee amount #31
+- feat: Add member `PsbtParams::sighash_type` #25
+- feat: Update signer impl for `XOnlyPublicKey` #20
+- feat: Allow multiple change sources #18
+
+### Changed
+
+- chore: Bump MSRV to 1.85.0 #23
+- `SelectorParams::target_feerate` field is renamed to `fee_strategy`.
+- `SelectorParams::change_policy` field is changed to have type `bdk_coin_select::ChangePolicy`.
+- `SelectorParams::new` is changed to accept the `FeeStrategy` and `ChangePolicy` as inputs.
+- deps: Bump `miniscript` to 12.3.5
+- deps: Bump `bdk_coin_select` to 0.4.1
+
+### Fixed
+
+- fix: Include `fallback_locktime` in locktime accumulation #24
+
+### Removed
+
+- `SelectorParams::change_weight` field is removed now that the change weights are represented in the actual change policy.
+- Removed `SelectorParams::to_cs_change_policy` as the conversion is no longer necessary.
+- Removed `ChangePolicyType` enum to allow the user to construct the intended `ChangePolicy`.
+
+## [0.1.0]
+
+### Added
+
+- The new "Tx builder" #1
+
+[unreleased]: https://github.com/bitcoindevkit/bdk-tx/compare/0.2.0...HEAD
+[0.2.0]: https://github.com/bitcoindevkit/bdk-tx/compare/0.1.0...0.2.0
+[0.1.0]: https://github.com/bitcoindevkit/bdk-tx/releases/tag/0.1.0