docs: add npm version to readme

Author: Draeken

README.md

@@ -1 +1,4 @@
-[![Build Status](https://travis-ci.org/AutoScheduleJS/react-elements.svg?branch=master)](https://travis-ci.org/AutoScheduleJS/react-elements#)
+[![Build Status](https://travis-ci.org/AutoScheduleJS/react-elements.svg?branch=master)](https://travis-ci.org/AutoScheduleJS/react-elements#)
+[![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg?style=flat-square)](https://github.com/prettier/prettier)
+[![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg?style=flat-square)](https://github.com/semantic-release/semantic-release)
+[![npm version](https://badge.fury.io/js/%40autoschedule%2Freact-elements.svg)](https://www.npmjs.com/package/@autoschedule/react-elements)