Update the changelog

Author: ejpcmac

CHANGELOG.md

@@ -6,7 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic
 Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [0.2.1] - 2020-07-19
 
 ### Added
 
@@ -78,7 +78,7 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 * Default values
 * Enforced keys
 
-[Unreleased]: https://github.com/ejpcmac/typed_struct/compare/master...develop
+[0.2.1]: https://github.com/ejpcmac/typed_struct/compare/v0.2.0...v0.2.1
 [0.2.0]: https://github.com/ejpcmac/typed_struct/compare/v0.1.4...v0.2.0
 [0.1.4]: https://github.com/ejpcmac/typed_struct/compare/v0.1.3...v0.1.4
 [0.1.3]: https://github.com/ejpcmac/typed_struct/compare/v0.1.2...v0.1.3