message: Prepare changelog for v0.10.7-rc.3
diff: +Changes in [0.10.7-rc.3](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v0.10.7-rc.3) (2017-10-13)
  +===============================================================================================================
  +[Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v0.10.7-rc.2...v0.10.7-rc.3)
  +
  + * Fix the enableLabs flag, again
  + [\#1474](https://github.com/matrix-org/matrix-react-sdk/pull/1474)
  +
  Changes in [0.10.7-rc.2](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v0.10.7-rc.2) (2017-10-13)
  ===============================================================================================================
  [Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v0.10.7-rc.1...v0.10.7-rc.2)
  