message: Prepare changelog for v0.8.6-rc.2
diff: +Changes in [0.8.6-rc.2](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v0.8.6-rc.2) (2017-02-03)
  +=============================================================================================================
  +[Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v0.8.6-rc.1...v0.8.6-rc.2)
  +
  + * Update to new matrix-js-sdk to get support for new device change notifications interface
  +
  +
  Changes in [0.8.6-rc.1](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v0.8.6-rc.1) (2017-02-03)
  =============================================================================================================
  [Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v0.8.5...v0.8.6-rc.1)
  