Create README.md

README.md

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 # react-native-autoheight-webview
 An auto height webview for React Native.
 
+Cause of moving View.propTypes to ViewPropTypes in React Naitve 44 (https://github.com/facebook/react-native/releases) and PropTypes has been moved to a separate package in React 16 (https://facebook.github.io/react/blog/2017/04/07/react-v15.5.0.html#migrating-from-react.proptypes), please install react-native-autoheight-webview 0.2.3 for the project with rn version lower than 0.44.
+
 `npm install react-native-autoheight-webview --save`
 
+`npm install react-native-autoheight-webview@0.2.3 --save` (if the project with rn version lower than 0.44)
+
 ## android
 `react-native link react-native-autoheight-webview`