Add update to kube-prom-stack to CHANGELOG.md

CHANGELOG.md

 # Changelog
+
 All notable changes to this project will be documented in this file.
 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).
@@ -7,7 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 * Changed project name from OpenAppStack to Stackspin
 * Update:
-  * Kube-prometheus-stack to helm chart version 18.0.12
+  * Kube-prometheus-stack to helm chart version 22.0.0
 
 ## [0.7.0] - 2021-08-19