Update README.md

Author: Javier Morant

README.md

@@ -2,6 +2,7 @@
 UI component for React Native that allows to create a listview with N levels of nesting
 
 ![platforms](https://img.shields.io/badge/platforms-Android%20%7C%20iOS-brightgreen.svg?style=flat-square)
+[![CircleCI](https://circleci.com/gh/fjmorant/react-native-nested-listview.svg?style=svg)](https://circleci.com/gh/fjmorant/react-native-nested-listview)
 [![dependencies Status](https://david-dm.org/boennemann/badges/status.svg)](https://david-dm.org/boennemann/badges)
 [![npm](https://img.shields.io/npm/v/react-native-nested-listview.svg?style=flat-square)](https://www.npmjs.com/package/react-native-nested-listview)
 [![github release](https://img.shields.io/github/release/fjmorant/react-native-nested-listview.svg?style=flat-square)](https://github.com/fjmorant/react-native-nested-listview/releases)