Bump version to v0.13.7

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]
+## [0.13.7] - 2022-01-24
 
 ### Fixed
 
@@ -304,6 +304,7 @@ simple to migrate existing tests to the new API. Please see the
 [0.13.4]: https://github.com/dogmatiq/testkit/releases/tag/v0.13.4
 [0.13.5]: https://github.com/dogmatiq/testkit/releases/tag/v0.13.5
 [0.13.6]: https://github.com/dogmatiq/testkit/releases/tag/v0.13.6
+[0.13.7]: https://github.com/dogmatiq/testkit/releases/tag/v0.13.7
 [v0.11.0 migration guide]: https://github.com/dogmatiq/testkit/blob/main/docs/MIGRATING-v0.11.0.md
 
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