Update README_CN.md

-# flutter_screenUtil
+# flutter_screenutil
 
 [![pub package](https://img.shields.io/pub/v/flutter_screenutil.svg)](https://pub.dartlang.org/packages/flutter_screenutil)
+[![pub points](https://badges.bar/flutter_screenutil/pub%20points)](https://pub.dev/packages/flutter_screenutil/score)
+[![popularity](https://badges.bar/flutter_screenutil/popularity)](https://pub.dev/packages/flutter_screenutil/score)
 
 **flutter 屏幕适配方案，让你的UI在不同尺寸的屏幕上都能显示合理的布局!**