Update README.md

Author: camilledupont

README.md

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 Pixano Elements
 ===============
-[![License](https://img.shields.io/badge/license-CeCILL--C-blue.svg)](LICENSE) [![Live Demo](https://img.shields.io/badge/demo-online-green.svg)](http://pixano.cea.fr/smart-annotation/) [![Published on npm](https://img.shields.io/npm/v/@pixano/graphics-2d.svg)](https://www.npmjs.com/package/@pixano/graphics-2d)
+[![License](https://img.shields.io/badge/license-CeCILL--C-blue.svg)](LICENSE) [![Live Demo](https://img.shields.io/badge/demo-online-green.svg)](http://pixano.cea.fr/smart-annotation/) [![Published on npm](https://img.shields.io/npm/v/@pixano/graphics-2d.svg)](https://www.npmjs.com/package/@pixano/graphics-2d) ![Node.js CI](https://github.com/pixano/pixano-elements/workflows/Node.js%20CI/badge.svg)
 
 
 Pixano Elements - Re-usable web components dedicated to data annotation tasks.