Update changelog

CHANGELOG.md

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+<!-- if you're not the release manager, do your edits to changelog in CHANGELOG-draft.md -->
 
+# [2021-08-27]
+
+## Release Notes
+
+## API Changes
+
+* Deprecate `DELETE /conversations/:cnv/members/:usr` (#1697)
+* Add `DELETE /conversations/:cnv/members/:domain/:usr` (#1697)
+
+## Features
+
+## Bug fixes and other updates
+
+* Fix case sensitivity in schema parser in hscim library (#1714)
+* [helm charts] resolve a rate-limiting issue when using certificate-manager alongside wire-server and nginx-ingress-services helm charts (#1715)
+
+## Documentation
+
+* Improve Swagger for `DELETE /conversations/:cnv/members/:usr` (#1697)
+
+## Internal changes
+
+* Integration test script now displays output interactively (#1700)
+* Fixed a few issues with error response documentation in Swagger (#1707)
+* Make mapping between (team) permissions and roles more lenient (#1711)
+* The `DELETE /conversations/:cnv/members/:usr` endpoint rewritten to Servant (#1697)
+* Remove leftover auto-connect internal endpoint and code (#1716)
+* Bump wire-webapp (#1720)
+* Bump team-settings (#1721)
+* Bump account-pages (#1666)
+
+## Federation changes
+
+* Added client certificate support for server to server authentication (#1682)
+* Implemented full server-to-server authentication (#1687)
+* Add an endpoint for removing a qualified user from a local conversation (#1697)
 
-<!-- if you're not the release manager, do your edits to changelog in CHANGELOG-draft.md -->
 
 # [2021-08-16]