Update changelog

Author: ja573

CHANGELOG.md

@@ -5,6 +5,8 @@ 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).
 
 ## [Unreleased]
+
+## [[0.11.5]](https://github.com/thoth-pub/thoth/releases/tag/v0.11.5) - 2023-09-05
 ### Security
   - Upgrade `actix-web` to v4.4.0
   - Upgrade `tempfile` to v3.8.0