Update README.md

README.md

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-# react-native-fetch-blob [![npm version](https://badge.fury.io/js/react-native-fetch-blob.svg)](https://badge.fury.io/js/react-native-fetch-blob) ![](https://img.shields.io/badge/PR-Welcome-brightgreen.svg)
+# react-native-fetch-blob [![npm version](https://img.shields.io/badge/npm package-0.5.1-brightgreen.svg)](https://badge.fury.io/js/react-native-fetch-blob) ![](https://img.shields.io/badge/PR-Welcome-brightgreen.svg)
 
 A module provides upload, download, and files access API. Supports file stream read/write for process large files.