Update changelog

Co-authored-by: Baptiste Jonglez <git@bitsofnetworks.org>
Co-authored-by: Alexis Métaireau <alexis@notmyidea.org>

CHANGELOG.md

@@ -5,6 +5,10 @@ This document describes changes between each past release.
 ## 6.2.0 (unreleased)
 
 - Add support for python 3.12 (#757)
+- Migrate from setup.cfg to pyproject.toml (#1243)
+- Update to wtforms 3.1 (#1248)
+- Document [repository rules](https://ihatemoney.readthedocs.io/en/latest/contributing.html#repository-rules) (#1253)
+- Add "reimbursement" bills and allow to create them directly from the "Settle" page (#1290)
 - Remove support for python 3.7
 - Replace the black linter by ruff
 - Replace virtualenv and pip by uv