Update CHANGELOG.md

Author: gfrn

CHANGELOG.rst

@@ -7,6 +7,14 @@ 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).
 
++++++++++
+v0.16.1 (17/10/2025)
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+
+**Fixed**
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+- Pin Pillow version to prevent image rendering issues in FPDF2
+
 +++++++++
 v0.16.0 (16/10/2025)
 +++++++++