Update CHANGELOG.md

Author: nicolasdalsass

CHANGELOG.md

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 # Changelog
 
+## [Version 1.3.1](https://github.com/dataiku/dss-plugin-nlp-preparation/releases/tag/v1.3.1) - Bugfix release - 2025-01
+- 🐛 Fixed code env building on Python 3.7 and 3.8
+
 ## [Version 1.3.0](https://github.com/dataiku/dss-plugin-nlp-preparation/releases/tag/v1.3.0) - New feature - 2023-04
 - ✨ Added Python 3.8 and 3.9 support