docs: mention the Keep a Changelog project in the README and CHANGELOG files for reference (#1178)

Author: jenstroeger

CHANGELOG.md

@@ -1,4 +1,8 @@
-This project follows the [semantic versioning](https://packaging.python.org/en/latest/discussions/versioning/#semantic-versioning-vs-calendar-versioning) and [pre-release versioning](https://packaging.python.org/en/latest/discussions/versioning/) schemes recommended by the Python Packaging Authority [here](https://packaging.python.org/en/latest/specifications/version-specifiers/).
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+This project adheres to [semantic versioning](https://packaging.python.org/en/latest/discussions/versioning/#semantic-versioning-vs-calendar-versioning) and [pre-release versioning](https://packaging.python.org/en/latest/discussions/versioning/) schemes recommended by the Python Packaging Authority [here](https://packaging.python.org/en/latest/specifications/version-specifiers/). The format of this file is loosely based on [Keep a Changelog](https://keepachangelog.com/).
 
 ## v2.19.1 (2026-04-24)
 

README.md

@@ -50,7 +50,7 @@ Documentation is important, and [Sphinx](https://www.sphinx-doc.org/en/master/)
 
 ### Versioning and publishing
 
-Automatic package versioning and tagging, publishing to [PyPI](https://pypi.org/), and [Changelog](https://en.wikipedia.org/wiki/Changelog) generation are enabled using Github Actions. Furthermore, an optional [Release Notification](https://github.com/jenstroeger/python-package-template/tree/main/.github/workflows/release-notifications.yaml) Action allows Github to push an update notification to a [Slack bot](https://api.slack.com/bot-users) of your choice. For setup instructions, please see [below](#versioning-publishing-and-changelog).
+Automatic package versioning and tagging, publishing to [PyPI](https://pypi.org/), and [Changelog](https://keepachangelog.com/) generation are enabled using Github Actions. Furthermore, an optional [Release Notification](https://github.com/jenstroeger/python-package-template/tree/main/.github/workflows/release-notifications.yaml) Action allows Github to push an update notification to a [Slack bot](https://api.slack.com/bot-users) of your choice. For setup instructions, please see [below](#versioning-publishing-and-changelog).
 
 ### Dependency analysis