Prepare changelog for v3.16.0-rc.2

Author: RiotRobot

CHANGELOG.md

@@ -1,3 +1,9 @@
+Changes in [3.16.0-rc.2](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v3.16.0-rc.2) (2021-03-10)
+===============================================================================================================
+[Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v3.16.0-rc.1...v3.16.0-rc.2)
+
+ * Fixed incorrect build output in rc.1
+
 Changes in [3.16.0-rc.1](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v3.16.0-rc.1) (2021-03-10)
 ===============================================================================================================
 [Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v3.15.0...v3.16.0-rc.1)