Update changelog

Author: davidmz

CHANGELOG.md

@@ -6,6 +6,11 @@ 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).
 
 ## [1.135.0] - Not released
+### Added
+- The PWA manifest and the service worker was added. The service worker caches
+  all site assets, including web fonts. It also caches user profile pictures (up
+  to 100 entries). The AppUpdated component periodically checks the service
+  worker for update.
 
 ## [1.134.4] - 2024-08-26
 ### Changed