✏️ update changelog

Author: erincdustin

CHANGELOG.md

@@ -5,6 +5,9 @@ All notable changes to the ordercloud-javascript-sdk will be documented in this
 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).
 
+# [6.1.2] - 2024-09-11
+- Bring SDK up to date with API [v1.0.359](https://ordercloud.io/release-notes/v1.0.359), which adds Gratuity to the Order model
+
 # [6.1.1] - 2024-09-05
 - Bring SDK up to date with API [v1.0.357](https://ordercloud.io/release-notes/v1.0.357), which adds QuantityLimitPerOrder to Promotions and introduces Inventory Record Entity Sync