Update CHANGELOG.md for Taproot

Author: afilini

CHANGELOG.md

@@ -13,6 +13,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Upgrade to rust-bitcoin `0.28`
 - If using the `sqlite-db` feature all cached wallet data is deleted due to a possible UTXO inconsistency, a wallet.sync will recreate it  
 - Update `PkOrF` in the policy module to become an enum
+- Add experimental support for Taproot, including:
+  - Support for `tr()` descriptors with complex tapscript trees
+  - Creation of Taproot PSBTs (BIP-371)
+  - Signing Taproot PSBTs (key spend and script spend)
+  - Support for `tr()` descriptors in the `descriptor!()` macro
 
 ## [v0.18.0] - [v0.17.0]