chore: update changelog

Author: crystall-bitquill

CHANGELOG.md

@@ -3,6 +3,10 @@ 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/#semantic-versioning-200).
 
+## [?]
+### :magic_wand: Added
+- Elastic Load Balancer URL support ([PR#476](https://github.com/awslabs/aws-advanced-jdbc-wrapper/pull/476)).
+
 ## [2.1.2] - 2023-5-21
 ### :crab: Changed
 - Explicitly check for 28000 and 28P01 SQLStates in the IAM authentication plugin after SQLExceptions are thrown ([PR #456](https://github.com/awslabs/aws-advanced-jdbc-wrapper/pull/456) and [PR #457](https://github.com/awslabs/aws-advanced-jdbc-wrapper/pull/457)).