docs: add --skip-auth to changelog

Author: anasstahr

CHANGELOG.md

@@ -5,6 +5,12 @@ 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).
 
+## Unreleased
+
+### Added
+
+- `--skip-auth` flag to allow unsigned requests when AWS credentials are unavailable (#260)
+
 ## v1.4.2 (2026-04-30)
 
 ### Fixed