Add changelog notes for v1.2.2

Author: the-mikedavis

CHANGELOG.md

@@ -6,6 +6,13 @@ 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).
 
+## 1.2.2 - 2025-12-15
+
+### Fixed
+
+- Added topic's join ref to pushed messages.
+    - This fixes compatibility with Phoenix 1.8.3+.
+
 ## 1.2.1 - 2025-12-08
 
 ### Fixed