LiZhuoyuan
Committed by GitHub

Update README.md

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[Update log](https://github.com/OpenFlutter/flutter_screenutil/blob/master/CHANGELOG.md)
## Note
v3 requires `flutter >= 1.19.0`.
![v3](https://github.com/OpenFlutter/flutter_screenutil/tree/beta) requires `flutter >= 1.19.0`.
v2 for current stable version of flutter.
## Usage:
... ...