merge 4.0.2+3

+# 5.0.0-nullsafety.3
+- merge 4.0.2+3
+
 # 5.0.0-nullsafety.2
 - merge 4.0.2+2 #186
 

@@ -23,7 +23,7 @@ dependencies:
   flutter:
     sdk: flutter
   # add flutter_screenutil
-  flutter_screenutil: ^5.0.0-nullsafety.1
+  flutter_screenutil: ^{latest version}
 ```
 ### Add the following imports to your Dart code:
 ```dart

@@ -28,7 +28,7 @@ dependencies:
   flutter:
     sdk: flutter
   # 添加依赖
-  flutter_screenutil: ^5.0.0-nullsafety.1
+  flutter_screenutil: ^{latest version}
 ```
 ### 在每个使用的地方导入包：
 ```dart

@@ -24,7 +24,7 @@ dependencies:
   flutter:
     sdk: flutter
   # add flutter_screenutil
-  flutter_screenutil: ^5.0.0-nullsafety.1
+  flutter_screenutil: ^{latest version}
 ```
 
 ### Adicione o seguinte import em seu código Dart:

@@ -22,7 +22,9 @@ class ScreenUtilInit extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return LayoutBuilder(
+      // ignore: missing_return
       builder: (_, BoxConstraints constraints) {
+        if (constraints.maxWidth != 0) {
           ScreenUtil.init(
             constraints,
             designSize: designSize,

 name: flutter_screenutil
 description: A flutter plugin for adapting screen and font size.Guaranteed to look good on different models
-version: 5.0.0-nullsafety.2
+version: 5.0.0-nullsafety.3
 homepage: https://github.com/OpenFlutter/flutter_screenutil
 
 environment: