message: Update changelog to reflect remaining work
diff: These TODOs will be resolved before a full release. ([GitHub project](https://github.com/TypeStrong/typedoc/projects/11))
  -- Make comment parser options configurable from tsdoc.json.
  - Full support for declaration references, #262, #488, #1326, #1845.
  - Add support for additional comment styles, #1433.
  -- Theme: Custom rendering for `@see` tags.
  +- (Maybe) `@copyDoc` tag to copy parts of documentation from other entries.
  +- (Maybe) `--commentDiscovery` option to delegate discovery to TypeScript.
  ### Breaking Changes
  