message: update changelog for v0.20.0
diff: @@ -6,7 +6,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
  -## [0.19.0]
  +## [0.20.0] - 2020-11-13
  +### Added
  + - more language server features: onWorkspaceSymbol, onSignatureHelp, onDocumentSymbol, onReferences, improve onDefinition ([#191](https://github.com/rokucommunity/brighterscript/pull/191))
  +
  +
  +
  +## [0.19.0] - 2020-11-04
  ### Changed
  - `emitDefinitions` now defaults to `false` (it previously defaulted to `true`)
  ### Fixed
  @@ -701,3 +707,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
  [0.18.1]: https://github.com/rokucommunity/brighterscript/compare/v0.18.0...v0.18.1
  [0.18.2]: https://github.com/rokucommunity/brighterscript/compare/v0.18.1...v0.18.2
  [0.19.0]: https://github.com/rokucommunity/brighterscript/compare/v0.18.2...v0.19.0
  +[0.20.0]: https://github.com/rokucommunity/brighterscript/compare/v0.19.0...v0.20.0
  \ No newline at end of file
  