update CHANGELOG for 2.2.1

CHANGELOG.md

@@ -4,6 +4,25 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
+## [2.2.1] - 2023-03-09
+
+### Added
+
+* `download_repo_index_v2()` and `download_repo_index_v2()` API functions
+  https://gitlab.com/fdroid/fdroidserver/-/merge_requests/1323
+
+### Fixed
+
+* Fix OpenJDK detection on different CPU architectures
+  https://gitlab.com/fdroid/fdroidserver/-/merge_requests/1315
+
+### Removed
+
+* Purge all references to `zipalign`, that is delegated to other things
+  https://gitlab.com/fdroid/fdroidserver/-/merge_requests/1316
+* Remove obsolete, unused `buildozer` build type
+  https://gitlab.com/fdroid/fdroidserver/-/merge_requests/1322
+
 ## [2.2.0] - 2023-02-20
 
 ### Added