message: add missing changelog diff link.
diff: @@ -762,3 +762,5 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
  [0.21.0]: https://github.com/rokucommunity/brighterscript/compare/v0.20.1...v0.21.0
  [0.22.0]: https://github.com/rokucommunity/brighterscript/compare/v0.21.0...v0.22.0
  [0.22.1]: https://github.com/rokucommunity/brighterscript/compare/v0.22.0...v0.22.1
  +[0.22.1]: https://github.com/rokucommunity/brighterscript/compare/v0.22.0...v0.22.1
  +[0.23.0]: https://github.com/rokucommunity/brighterscript/compare/v0.22.1...v0.23.0
  \ No newline at end of file
  