chore: update CHANGELOG

CHANGELOG.md

@@ -7,6 +7,16 @@ More expansive patch notes and explanations may be found in the specific [pathfi
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+### Added
+
+- Pathfinder now supports storing only the latest state of the Merkle tries. This can be enabled by specifying '--storage.prune-merkle-tries true' on the command line when creating a new database.
+  - When enabled, storage proofs can be generated only for the latest block.
+  - Pruned merkle tries take significantly less disk space than full ones.
+  - Pathfinder stores this setting in its database and defaults to using that.
+  - Once set pruning cannot be enabled/disabled for non-empty databases.
+
 ## [0.11.3] - 2024-03-13
 
 ### Fixed