docs(CHANGES): Note pytest configuration in pyproject.toml

Author: tony

CHANGES

@@ -21,6 +21,10 @@ $ pipx install --suffix=@next 'vcspull' --pip-args '\--pre' --force
 
 <!-- Maintainers, insert changes / features for the next release here -->
 
+### Breaking changes
+
+- Python 3.7 Dropped (#421)
+
 ## vcspull v1.22.0 (2023-09-02)
 
 _Maintenance only, no bug fixes, or new features_