message: Prepare changelog for v0.11.3
diff: +Changes in [0.11.3](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v0.11.3) (2017-12-04)
  +=====================================================================================================
  +[Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v0.11.2...v0.11.3)
  +
  + * Bump js-sdk version to pull in fix for [setting room publicity in a group](https://github.com/matrix-org/matrix-js-sdk/commit/aa3201ebb0fff5af2fb733080aa65ed1f7213de6).
  +
  Changes in [0.11.2](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v0.11.2) (2017-11-28)
  =====================================================================================================
  [Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v0.11.1...v0.11.2)
  