Prepare changelog for v3.6.0

Author: RiotRobot

CHANGELOG.md

@@ -1,3 +1,13 @@
+Changes in [3.6.0](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v3.6.0) (2020-10-12)
+===================================================================================================
+[Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v3.6.0-rc.1...v3.6.0)
+
+ * Upgrade JS SDK to 8.5.0
+ * [Release] Fix templating for v1 jitsi widgets
+   [\#5306](https://github.com/matrix-org/matrix-react-sdk/pull/5306)
+ * [Release] Use new preparing event for widget communications
+   [\#5304](https://github.com/matrix-org/matrix-react-sdk/pull/5304)
+
 Changes in [3.6.0-rc.1](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v3.6.0-rc.1) (2020-10-07)
 =============================================================================================================
 [Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v3.5.0...v3.6.0-rc.1)