docs(readme): remove dependencies badge

Author: pradel

README.md

@@ -3,7 +3,6 @@
 [![npm version](https://img.shields.io/npm/v/react-responsive-modal.svg)](https://www.npmjs.com/package/react-responsive-modal)
 [![npm downloads per month](https://img.shields.io/npm/dm/react-responsive-modal.svg)](https://www.npmjs.com/package/react-responsive-modal)
 [![codecov](https://img.shields.io/codecov/c/github/pradel/react-responsive-modal/master.svg)](https://codecov.io/gh/pradel/react-responsive-modal)
-[![dependencies Status](https://david-dm.org/pradel/react-responsive-modal/status.svg)](https://david-dm.org/pradel/react-responsive-modal)
 
 A simple responsive and accessible react modal.