message: Prepare changelog for v0.13.0-rc.2
diff: +Changes in [0.13.0-rc.2](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v0.13.0-rc.2) (2018-07-24)
  +===============================================================================================================
  +[Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v0.13.0-rc.1...v0.13.0-rc.2)
  +
  + * Take jitsi conf calling out of labs
  + [\#2087](https://github.com/matrix-org/matrix-react-sdk/pull/2087)
  +
  Changes in [0.13.0-rc.1](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v0.13.0-rc.1) (2018-07-24)
  ===============================================================================================================
  [Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v0.12.9...v0.13.0-rc.1)
  