add 2.7.1 changelog

Author: ndgrigorian

CHANGELOG.md

@@ -4,11 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [dev] (MM/DD/YYYY)
-
-### Added
+## [2.7.1] (05/08/2026)
 
 ### Changed
+* Make `mkl-service` backward compatibility from MKL 2026.0 down to at least 2023.2 [gh-193](https://github.com/IntelPython/mkl-service/pull/193)
 
 ### Fixed
 * Changed insecure HTTP URLs to HTTPS in `pyproject.toml` and conda recipe files for improved security