message: Prepare changelog for v0.10.5
diff: +Changes in [0.10.5](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v0.10.5) (2017-09-21)
  +=====================================================================================================
  +[Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v0.10.4...v0.10.5)
  +
  + * Fix build error (https://github.com/vector-im/riot-web/issues/5091)
  +
  Changes in [0.10.4](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v0.10.4) (2017-09-20)
  =====================================================================================================
  [Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v0.10.4-rc.1...v0.10.4)
  