Update changelog for 2.0rc4

CHANGELOG.rst

@@ -6,8 +6,8 @@ All notable changes to this project will be documented in this file.
 The format is based on `Keep a Changelog`_,
 and this project adheres to `Semantic Versioning`_.
 
-Unreleased
-----------
+`2.0rc4`_ - 2021-08-01
+----------------------
 
 Added
 ~~~~~
@@ -18,6 +18,7 @@ Fixed
 ~~~~~
 
 * Use text HTTP response for serviceworker.js insteas of binary stream
+* Use Django permission instead of rule to prevent performance issues.
 
 `2.0rc3`_ - 2021-07-26
 ----------------------