add changelog

Author: stegaBOB

CHANGELOG.md

@@ -6,6 +6,8 @@ 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]
+### Added
+- Allow lifetime `for<'a, ...>` bounds in non-bounded generic parameters.
 
 ### Changed
 - Use the `Copy` implementation for `Clone` and the `Ord` implementation for