[skip ci] update CHANGELOG for 2.3.11

Author: jcheron

CHANGELOG.md

@@ -5,7 +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).
 
 ## [Unrelease]
-## [2.3.11] Soon
+- nothing
+## [2.3.11] 2020-07-28
 ### Added
 - `DAOCache` (caches objects loaded by id)
 - `MemcachedDriver` system