Update CHANGELOG with pyproject.toml migration changes

Co-authored-by: RMeli <11348981+RMeli@users.noreply.github.com>

Author: Copilot

CHANGELOG.md

@@ -11,11 +11,20 @@ Contributors: @RMeli
 ### Added
 
 * Python `3.13` and `3.14` in CI [PR #147 | @RMeli]
+* Optional dependencies for testing (`test`), development (`dev`), and parallelization (`parallel`) in `pyproject.toml` [PR #XXX | @RMeli]
+
+### Changed
+
+* Migrated all package configuration from `setup.cfg` and `setup.py` to `pyproject.toml` [PR #XXX | @RMeli]
+* Workflows to use `pip install -e .` instead of `python setup.py develop` [PR #XXX | @RMeli]
 
 ### Removed
 
 * support for Open Babel [PR #151 | @RMeli]
 * Python `3.9` and `3.10` from CI [PR #147 | @RMeli]
+* `setup.cfg` file in favour of `pyproject.toml` [PR #XXX | @RMeli]
+* `setup.py` file in favour of `pyproject.toml` [PR #XXX | @RMeli]
+* `.coveragerc` file in favour of `pyproject.toml` [PR #XXX | @RMeli]
 
 ## Version 0.9.0