update changes.md

Author: zoran995

CHANGES.md

@@ -1,5 +1,12 @@
 # Change Log
 
+#### next release (0.4.7)
+
+- Upgrade terriajs-server to version 5 alpha
+  - Requires node version 22 or above
+  - Comes with a new version of proxy rewritten using undici instead of deprecated `request` package. This should improve the performance and reliability of the proxy. Please test your map with this new version of terriajs-server and report any issues you find.
+  - For full changelog see [terriajs-server CHANGES.md](https://github.com/TerriaJS/terriajs-server/blob/master/CHANGES.md#next-release---unreleased)
+
 #### 0.4.6
 
 - Upgrades TerriaJS to [8.12.2](https://github.com/TerriaJS/terriajs/blob/main/CHANGES.md#8120---2026-03-27)