roll back Changelog header to initial status

Author: beachdweller

CHANGELOG.md

@@ -5,14 +5,17 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 
-## [Unreleased] - 2024-10-02
++## [Unreleased] - YYYY-MM-DD
 
 ### Added
 * API key as a required input.
 
 ### Changed
 * append integration step feedback output to the GITHUB_OUTPUT file of verification step.
 
+### Deprecated
+
+
 ### Removed
 * environment variable 'GOOGLE_API_KEY'.