message: update changelog for v0.13.0
diff: @@ -6,6 +6,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
  +## [0.13.0] - 2020-08-10
  +### Added
  + - ability to mark the `extends` and `project` options in `bsconfig.json`, API and CLI as optional.
  +
  +
  +
  ## [0.12.4] - 2020-08-06
  ### Fixed
  - bug in cli that wouldn't properly read bsconfig values. [#167](https://github.com/rokucommunity/brighterscript/issues/167)
  @@ -442,6 +448,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
  +[0.13.0]: https://github.com/rokucommunity/brighterscript/compare/v0.12.4...v0.13.0
  [0.12.4]: https://github.com/rokucommunity/brighterscript/compare/v0.12.3...v0.12.4
  [0.12.3]: https://github.com/rokucommunity/brighterscript/compare/v0.12.2...v0.12.3
  [0.12.2]: https://github.com/rokucommunity/brighterscript/compare/v0.12.1...v0.12.2
  