Update CHANGELOG.md

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CHANGELOG.md

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 # Changelog
 
 ## [Version 1.2.0](https://github.com/dataiku/dss-plugin-nlp-preparation/releases/tag/v1.2.0) - New feature and bugfix release - 2021-04
-- ✨ Re-added Japanese support
+- ✨ Added Python 3.7 and Japanese support
 - 🐛 Fixed silent failure when tokenizing long text (> 1 million characters)
 - 💄 Improved recipe interface loading time, enhanced logging and column descriptions