ADD swift 5.10 ci changes to changelog

Author: mflknr

CHANGELOG.md

@@ -2,5 +2,6 @@
 
 - [SwiftLint](https://github.com/realm/SwiftLint) with a .swiftlint.yml file. lint checks are done on CI
 - `Sendable` conformance to `Version` to satisfy build warnings when complete concurrency checks are enabled
+- Swift `5.10` to CI matrices
 
 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).