message: update changelog for v0.21.0
diff: @@ -6,6 +6,22 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
  +## [0.21.0] - 2020-11-19
  +### Added
  + - Catch when local variables and scope functions have the same name as a class. ([#246](https://github.com/rokucommunity/brighterscript/pull/246))
  + - Catch when functions use keyword names ([#247](https://github.com/rokucommunity/brighterscript/pull/247))
  +### Changed
  + - many internal changes:
  + - remove all the `BrsType` objects leftover from the upstream `brs` project. Things like `ValueKind`, `BrsType`, the `Token.literal` property.
  + - rename the brighterscript `BrsType` class to `BscType` for more distinction from the now deleted from-upstream `BrsType`.
  + - Modify the `createToken` function in `astUtils/creators.ts` to accept a range, or use a default negative range.
  + - Use the `BscType` objects for basic parser type tracking (this replaces `ValueKind` and `BrsType` from upstream `brs` project).
  + - minor AST property changes for `ForStatement` and `FunctionStatement`,
  + - any `ValueKind` references in code have been replaced with an instance of a `BscType` (which will be the backbone of future type tracking)
  + - Updated `ForStatement` to no longer include synthetic `step 1` tokens when those were not included in the source file.
  + - remove eliminated `BrsType` items from `reflection.ts`.
  +
  +
  ## [0.20.1] - 2020-11-16
  ### Changed
  - load plugins relatively to the project ([#242](https://github.com/rokucommunity/brighterscript/pull/242))
  @@ -716,3 +732,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
  [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
  [0.20.1]: https://github.com/rokucommunity/brighterscript/compare/v0.20.0...v0.20.1
  +[0.21.0]: https://github.com/rokucommunity/brighterscript/compare/v0.20.1...v0.21.0
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