Update changelog

CHANGELOG.md

@@ -4,12 +4,16 @@ All notable changes to this project will be documented in this file.
 
 This project adheres to [Semantic Versioning](https://semver.org).
 
+Releases may yanked if there is a security bug, a soundness bug, or a regression.
+
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 ## [Unreleased]
 
+- Work around an issue on negative_impls that allows unsound overlapping `Unpin` implementations. ([#357](https://github.com/taiki-e/pin-project/pull/357))
+
 ## [1.1.6] - 2024-10-05
 
 - Suppress `clippy::needless_lifetimes` lint in generated code.