Update README.md

README.md

@@ -45,7 +45,7 @@ Please set the size of the design draft before use, the width and height of the
 void main() {
   WidgetsFlutterBinding.ensureInitialized();
   //Set the fit size (fill in the screen size of the device in the design) If the design is based on the size of the iPhone6 ​​(iPhone6 ​​750*1334)
-  ScreenUtil.init(designSize: Size(750, 1334), allowFontScaling: false);
+  ScreenUtil.init(context, designSize: Size(750, 1334), allowFontScaling: false);
   runApp(MyApp());
 }