message: update changelog for v0.12.1
diff: @@ -6,7 +6,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
  -## [Unreleased]
  +## [0.12.1]
  ### Changed
  - upgraded to [roku-deploy@3.2.2](https://github.com/rokucommunity/roku-deploy/blob/master/CHANGELOG.md#322---2020-07-14)
  ### Fixed
  @@ -421,6 +421,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
  +[0.12.1]: https://github.com/rokucommunity/brighterscript/compare/v0.12.0...v0.12.1
  [0.12.0]: https://github.com/rokucommunity/brighterscript/compare/v0.11.3...v0.12.0
  [0.11.3]: https://github.com/rokucommunity/brighterscript/compare/v0.11.2...v0.11.3
  [0.11.2]: https://github.com/rokucommunity/brighterscript/compare/v0.11.1...v0.11.2
  