chore: Update CHANGELOG (#227)

Author: refeed

CHANGELOG.md

@@ -5,6 +5,13 @@ 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).
 
+## [1.0.0-beta.13] - 2025-02-07
+
+### Added
+- New condition type: `NotContains`
+- New feature to use variables within Tirith policies
+
+
 ## [1.0.0-beta.12] - 2024-04-02
 
 ### Fixed