message: update changelog for v0.48.0
diff: @@ -6,6 +6,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
  +## [0.48.0](https://github.com/rokucommunity/brighterscript/compare/v0.47.3...v0.48.0) - 2022-04-13
  +### Added
  + - language support for native BrightScript optional chaining ([#546](https://github.com/rokucommunity/brighterscript/pull/546))
  + - validation for all known `createObject` values and parameters. ([#435](https://github.com/rokucommunity/brighterscript/pull/435))
  +### Fixed
  + - add missing statements and expressions to `createVisitor` ([#567](https://github.com/rokucommunity/brighterscript/pull/567))
  +
  +
  +
  ## [0.47.3](https://github.com/rokucommunity/brighterscript/compare/v0.47.2...v0.47.3) - 2022-04-08
  ### Fixed
  - accuracy issues when parsing the manifest ([#565](https://github.com/rokucommunity/brighterscript/pull/565))
  