* Remove unstable support for `m.room_key.withheld` ([\#2512](https://github.com/matrix-org/matrix-js-sdk/pull/2512)). Fixes #2233. * Add support for MSC3575: Sliding Sync ([\#2242](https://github.com/matrix-org/matrix-js-sdk/pull/2242)). * Re-insert room IDs when decrypting bundled redaction events returned by `/sync` ([\#2531](https://github.com/matrix-org/matrix-js-sdk/pull/2531)). Contributed by @duxovni. * Correct the units in TURN servers expiry documentation ([\#2520](https://github.com/matrix-org/matrix-js-sdk/pull/2520)).