Update CHANGELOG.md to include new migration options and error handling improvements

Author: grongierisc

CHANGELOG.md

@@ -5,6 +5,16 @@ 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
+- new option for migrate `--force-local` to force local migration even if remote url is provided in the `settings.py` file
+- `verify_ssl` option in `settings.py` to enable or disable SSL verification for remote migration
+
+### Fixed
+- Fix an error when running `iop` command without a valid iris instance available
+  - Now it will log a warning instead of raising an exception
+- Support purging old messages in production settings
+
 ## [3.5.3] - 2025-08-01
 ### Fixed
 - Fix a regression test message interoperability where list of messages was not displayed correctly in the UI