message: Prepare changelog for v0.9.4
diff: +Changes in [0.9.4](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v0.9.4) (2017-06-14)
  +===================================================================================================
  +[Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v0.9.3...v0.9.4)
  +
  + * Ask for email address after setting password for the first time
  + [\#1090](https://github.com/matrix-org/matrix-react-sdk/pull/1090)
  + * DM guessing: prefer oldest joined member
  + [\#1087](https://github.com/matrix-org/matrix-react-sdk/pull/1087)
  + * More translations
  +
  Changes in [0.9.3](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v0.9.3) (2017-06-12)
  ===================================================================================================
  [Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v0.9.3-rc.2...v0.9.3)
  