docs: update CHANGELOG

Author: BriannaDelgado

CHANGELOG.md

@@ -5,6 +5,13 @@ 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
+- Added support for translation memories in text translation via
+  `setTranslationMemoryId()` and `setTranslationMemoryThreshold()` in
+  `TextTranslationOptions`.
+- Added `listTranslationMemories()` method to the `DeepLClient` class for
+  listing available translation memories.
+
 ### Fixed
 - Fixed GitLab release job using wrong image by explicitly setting `image: registry.gitlab.com/gitlab-org/release-cli:latest`.