Bump version to v1.2.0.

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
+## [1.2.0] - 2023-06-12
 
 ### Added
 
@@ -249,6 +249,7 @@ The two most important changes in usage are:
 [1.0.2]: https://github.com/dogmatiq/ferrite/releases/tag/v1.0.2
 [1.0.3]: https://github.com/dogmatiq/ferrite/releases/tag/v1.0.3
 [1.1.0]: https://github.com/dogmatiq/ferrite/releases/tag/v1.1.0
+[1.2.0]: https://github.com/dogmatiq/ferrite/releases/tag/v1.2.0
 
 <!-- version template
 ## [0.0.1] - YYYY-MM-DD