flutter_package / flutter_screenutil

fix #306

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Smart size changes for balanced size

Support for split screen

//smart size :  it check your value if it is bigger than your value set your value 
  //for example you have setted  16.sm() , if for your screen 16.sp() bigger than 16 it will  set 16 not 16.sp()
  //I think that it is good for save size balance on big sizes of screen

Update Readme.md

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