LiZhuoyuan
Committed by GitHub

Update README.md

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## Note
[v3](https://github.com/OpenFlutter/flutter_screenutil/tree/beta) requires `flutter >= 1.19.0`.
[v2](https://github.com/OpenFlutter/flutter_screenutil) for current stable version of flutter.
[v2](https://github.com/OpenFlutter/flutter_screenutil) requires `flutter < 1.19.0`.
## Usage:
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