Move changelog entries to top level

CHANGELOG.md

@@ -11,17 +11,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- Improved the consistency of cross-compilation assistance provided across all supported `target_triple` and host OS/architecture combinations. [#769](https://github.com/heroku/libcnb.rs/pull/769)
+- Added cross-compilation assistance for `aarch64-unknown-linux-musl` (on macOS and ARM64 Linux) and `x86_64-unknown-linux-musl` (on ARM64 Linux). [#769](https://github.com/heroku/libcnb.rs/pull/769)
 - `libcnb`:
   - Changed `Layer` interface from `&self` to `&mut self`. ([#669](https://github.com/heroku/libcnb.rs/pull/669))
-- `libcnb-package`:
-  - Improved the consistency of cross-compilation assistance provided across all supported `target_triple` and host OS/architecture combinations. [#769](https://github.com/heroku/libcnb.rs/pull/769)
 
 ### Added
 
 - `libherokubuildpack`:
   - `MappedWrite::unwrap` for getting the wrapped `Write` back out. ([#765](https://github.com/heroku/libcnb.rs/pull/765))
-- `libcnb-package`:
-  - Added cross-compilation assistance for `aarch64-unknown-linux-musl` (on macOS and ARM64 Linux) and `x86_64-unknown-linux-musl` (on ARM64 Linux). [#769](https://github.com/heroku/libcnb.rs/pull/769)
 
 ## [0.17.0] - 2023-12-06