Prepare release 1.17

To pick up #149.

Author: edmorley

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] - YYYY-MM-DD
+
+## [1.17] - 2026-04-14
 ### Changes
 - Add support for Heroku-26.
 - Update nginx from 1.28.0 to 1.28.3.