message: Prepare changelog for v0.11.4
diff: +Changes in [0.11.4](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v0.11.4) (2018-02-09)
  +=====================================================================================================
  +[Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v0.11.3...v0.11.4)
  +
  + * Add isUrlPermitted function to sanity check URLs
  +
  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)
  