doc: Update README.md

jaywcjlove · jaywcjlove · commit 5e9aa3555dd1 · 2020-08-01T18:50:53.000+08:00
diff --git a/README.md b/README.md
@@ -1,6 +1,8 @@
 @uiw/react-native-wechat
 -----
 
+[![NPM Version](https://img.shields.io/npm/v/@uiw/react-native-wechat.svg)](https://npmjs.org/package/@uiw/react-native-wechat)
+
 React Native 包使用微信分享、登录、收藏、支付等功能。
 
 ## 注意事项
