Update CHANGELOG

CHANGELOG.md

@@ -9,12 +9,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-### Added
+### Changed
 
 - `libcnb`:
-    - Low-level layer operations are now exposed via `BuildContext`. In most cases, users do not need to use them. They
-      serve as an escape hatch when the higher-level layers API doesn't support a certain
-      use-case. ([#786](https://github.com/heroku/libcnb.rs/pull/786))
+  - `WriteLayerError` changed to contain more specific error enums instead of generic ones. ([#786](https://github.com/heroku/libcnb.rs/pull/786))
 
 ## [0.19.0] - 2024-02-23