Update README.md

Author: lucasferreira

README.md

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 # react-native-simpledialog-android
 React Native Android module to use Android's AlertDialog - same idea of AlertIOS
 
+[![npm version](http://img.shields.io/npm/v/react-native-simpledialog-android.svg?style=flat-square)](https://npmjs.org/package/react-native-simpledialog-android "View this project on npm")
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 ### Installation
 
 ```bash