Update README.md

Author: tomauty

README.md

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 react-native-chart is a simple module for adding line charts, area charts, or bar charts to your React Native app.
 
+**NOTE!** The current major version (1.X.Y) is still being developed. If you are looking for the most recent iOS-only version, please download `^0.1.4`.
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 ![Screenshot](https://raw.githubusercontent.com/tomauty/react-native-chart/master/screenshots/README.png)
 
 ## Getting Started