updated readme

README.md

@@ -3,7 +3,7 @@
 [![license](https://img.shields.io/github/license/nzambello/react-csv-reader.svg)](https://github.com/nzambello/react-csv-reader/blob/master/LICENSE)
 [![npm version](https://badge.fury.io/js/react-csv-reader.svg)](https://www.npmjs.com/package/react-csv-reader)
 [![npm](https://img.shields.io/npm/dt/react-csv-reader.svg)](https://www.npmjs.com/package/react-csv-reader)
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+![Node.js CI](https://github.com/nzambello/react-csv-reader/workflows/Node.js%20CI/badge.svg?branch=master)
 
 React component that handles csv file input.  
 It handles file input and returns its content as a matrix.