message: Prepare changelog for v1.0.2-rc.3
diff: +Changes in [1.0.2-rc.3](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v1.0.2-rc.3) (2019-03-01)
  +=============================================================================================================
  +[Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v1.0.2-rc.2...v1.0.2-rc.3)
  +
  + * Misc room list improvements & invite fix
  + [\#2722](https://github.com/matrix-org/matrix-react-sdk/pull/2722)
  + * Move complex part of room sorting to a dedicated function
  + [\#2716](https://github.com/matrix-org/matrix-react-sdk/pull/2716)
  +
  Changes in [1.0.2-rc.2](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v1.0.2-rc.2) (2019-03-01)
  =============================================================================================================
  [Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v1.0.2-rc.1...v1.0.2-rc.2)
  