npm version tag

Author: BL

README.md

@@ -1,5 +1,5 @@
 # amazon-mws (Amazon Marketplace Web Service)
-[![Version](https://img.shields.io/badge/style-plastic-green.svg?longCache=true&style=plastic)](https://www.npmjs.org/package/amazon-mws)
+[![Version](https://img.shields.io/npm/v/amazon-mws.svg)](https://www.npmjs.org/package/amazon-mws)
 [![Build Status](https://travis-ci.org/bhushankumarl/amazon-mws.svg?branch=master)](https://travis-ci.org/bhushankumarl/amazon-mws)
 
 This API supported Amazon Marketplace Web Service(MWS)'s standard REST-style API that accepts/returns JSON requests and Here is the [API reference] (http://docs.developer.amazonservices.com/en_IN/dev_guide/DG_IfNew.html)