Update CHANGELOG

Author: razor-x

CHANGELOG.md

@@ -5,6 +5,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](https://semver.org/).
 
+## 1.2.0 / 2021-09-09
+
+### Added
+
+- Show CLI help with `blobpack help`.
+- Show CLI version with `blobpack version`.
+
 ## 1.1.0 / 2021-09-09
 
 ### Added