Update changelog.md for v1.11 (#124)

Author: dzuelke

changelog.md

@@ -4,7 +4,9 @@ All notable changes to this project will be documented in this file.
 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).
 
-## [unlreleased] - XXXX-XX-XX
+## [unreleased] - XXXX-XX-XX
+
+## [1.11] - 2024-05-29
 ### Changes
 - [heroku-18] Removed
 - Add documentation for migrating from heroku-community/static buildpack