Bump version to v0.16.0.

CHANGELOG.md

@@ -10,7 +10,7 @@ The format is based on [Keep a Changelog], and this project adheres to
 [Keep a Changelog]: https://keepachangelog.com/en/1.0.0/
 [Semantic Versioning]: https://semver.org/spec/v2.0.0.html
 
-## [Unreleased]
+## [0.16.0] - 2024-10-03
 
 ### Added
 
@@ -26,6 +26,7 @@ The format is based on [Keep a Changelog], and this project adheres to
 
 ### Changed
 
+- **[BC]** Changed message stubs to accept validation scopes.
 - The results of `Clone()`, `Merge()`, `Select()` and `Project()` on any map
   type are now guaranteed to be non-nil.
 - The results of `Clone()`, `Union()` and `Project()` on any set type are now
@@ -187,6 +188,7 @@ The format is based on [Keep a Changelog], and this project adheres to
 [0.14.0]: https://github.com/dogmatiq/enginekit/releases/v0.14.0
 [0.15.0]: https://github.com/dogmatiq/enginekit/releases/v0.15.0
 [0.15.1]: https://github.com/dogmatiq/enginekit/releases/v0.15.1
+[0.16.0]: https://github.com/dogmatiq/enginekit/releases/v0.16.0
 
 <!-- version template
 ## [0.0.1] - YYYY-MM-DD