Add git env var fix to changelog

CHANGELOG.md

@@ -5,6 +5,11 @@ All notable changes to Stability Matrix 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 2.0](https://semver.org/spec/v2.0.0.html).
 
+## v2.1.3
+
+### Fixed
+- Fixed [#59](https://github.com/LykosAI/StabilityMatrix/issues/61) - `GIT` environment variable is now set for the embedded portable git on Windows as A1111 uses it instead of default `PATH` resolution
+
 ## v2.1.2
 
 ### Changed