Update CHANGELOG.md

Author: alexcombessie

CHANGELOG.md

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 # Changelog
 
-## [Version 1.0.0](https://github.com/dataiku/dss-plugin-nlp-visualization/releases/tag/v1.0.0) - Initial release - 2021-04
+## [Version 1.0.0](https://github.com/dataiku/dss-plugin-nlp-visualization/releases/tag/v1.0.0) - Initial release - 2021-06
 - ☁  Visualize text data using word clouds...
 - 🌎 🌍 🌏   ... in 59 languages!