chore: minor addition to changelog to match copier uv template

Author: jmp75

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
 <!-- insertion marker -->
 
 ## v1.2.0 (2023-01-25)