updated changelog

Author: jekoorn

CHANGELOG.md

@@ -5,7 +5,9 @@ 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).
 
-## [Unreleased](https://github.com/NNPDF/yadism/compare/v0.13.7...HEAD)
+## [Unreleased](https://github.com/NNPDF/yadism/compare/v0.13.8...HEAD)
+
+## [0.13.8](https://github.com/NNPDF/yadism/compare/v0.13.7...v0.13.8) - 2026-01-16
 
 ### Changed
 - Add support for Python 3.13, lift minimum NumPy version to 2, and eko to 0.15 ([#340](https://github.com/NNPDF/yadism/pull/340))