Remove greenkeeper badge

Author: fjmorant

README.md

@@ -4,7 +4,6 @@
 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)
-[![Greenkeeper badge](https://badges.greenkeeper.io/fjmorant/react-native-nested-listview.svg)](https://greenkeeper.io/)
 [![CircleCI](https://circleci.com/gh/fjmorant/react-native-nested-listview.svg?style=shield)](https://circleci.com/gh/fjmorant/react-native-nested-listview)
 [![codecov](https://codecov.io/gh/fjmorant/react-native-nested-listview/branch/master/graph/badge.svg)](https://codecov.io/gh/fjmorant/react-native-nested-listview)
 [![npm](https://img.shields.io/npm/v/react-native-nested-listview.svg?style=flat-square)](https://www.npmjs.com/package/react-native-nested-listview)