Update changelog for 8.0.16

Author: kitchen-porter

CHANGELOG.md

@@ -5,7 +5,7 @@ This file is used to list changes made in each version of the perl cookbook.
 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
+## 8.0.16 - *2023-10-31*
 
 ## 8.0.15 - *2023-09-29*