Add changelog

Signed-off-by: Johannes Marbach <[email protected]>

Author: Johennes

crates/matrix-sdk/CHANGELOG.md

@@ -60,6 +60,10 @@ All notable changes to this project will be documented in this file.
 
 - [**breaking**] `OAuth::login` now allows requesting additional scopes for the authorization code grant.
   ([#5395](https://github.com/matrix-org/matrix-rust-sdk/pull/5395))
+- Add `OAuth::login_with_generated_qr_code` for generating a QR code on a new device
+  and logging it in with the help of an existing device scanning the code.
+  ([#5711](https://github.com/matrix-org/matrix-rust-sdk/pull/5711))
+
 
 ### Refactor