chore(readme): Fix npmjs hyperlink in readme (#638)

README.md

@@ -1,6 +1,10 @@
 # React Native WebView - a Modern, Cross-Platform WebView for React Native
 
-[![star this repo](http://githubbadges.com/star.svg?user=react-native-community&repo=react-native-webview&style=flat)](https://github.com/react-native-community/react-native-webview) [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](http://makeapullrequest.com) [![All Contributors](https://img.shields.io/badge/all_contributors-16-orange.svg?style=flat-square)](#contributors) [![Known Vulnerabilities](https://snyk.io/test/github/react-native-community/react-native-webview/badge.svg?style=flat-square)](https://snyk.io/test/github/react-native-community/react-native-webview)![version](https://img.shields.io/npm/v/react-native-webview.svg)
+[![star this repo](http://githubbadges.com/star.svg?user=react-native-community&repo=react-native-webview&style=flat)](https://github.com/react-native-community/react-native-webview) 
+[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](http://makeapullrequest.com) 
+[![All Contributors](https://img.shields.io/badge/all_contributors-16-orange.svg?style=flat-square)](#contributors) 
+[![Known Vulnerabilities](https://snyk.io/test/github/react-native-community/react-native-webview/badge.svg?style=flat-square)](https://snyk.io/test/github/react-native-community/react-native-webview)
+<a href="https://www.npmjs.com/package/react-native-webview"><img src="https://img.shields.io/npm/v/react-native-webview.svg"></a>
 
 **React Native WebView** is a modern, well-supported, and cross-platform WebView for React Native. It is intended to be a replacement for the built-in WebView (which will be [removed from core](https://github.com/react-native-community/discussions-and-proposals/pull/3)).