sections in changelog

Author: adamchainz

CHANGELOG.md

@@ -15,8 +15,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   -->
 
 ## [unreleased]
+
+### Added
 * Add 'code_verifier' parameter to token requests in documentation
+
+### Changed
 * Support Django 4.1.
+
+### Fixed
 * Remove upper version bound on Django, to allow upgrading to Django 4.1.1 bugfix release.
 
 ## [2.1.0] 2022-06-19