message: CHANGELOG: Add ChatRoomController data leak entry
diff: @@ -91,6 +91,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
  - Various flawed code kata translations. [#886](https://github.com/geli-lms/geli/issues/886)
  - Migrations for adding chatrooms to course and unit. [#886](https://github.com/geli-lms/geli/issues/888)
  - `AuthController` `addWhitelistedUserToCourses` broken condition & typos. [#895](https://github.com/geli-lms/geli/issues/895)
  +- `ChatRoomController` internal data leak. [#897](https://github.com/geli-lms/geli/issues/897)
  ### Security
  - Secured the static `'uploads'` route by introducing a special `'mediaToken'` with new JWT strategy & middleware. [#729](https://github.com/geli-lms/geli/issues/729)
  