5.0.0 readme

@@ -212,6 +212,7 @@ Column(
 
 #### Setting font does not change with system font size
 
+APP global:
 ```
  MaterialApp(
         debugShowCheckedModeBanner: false,
@@ -230,6 +231,11 @@ Column(
       ),
 ```
 
+Separate Text:
+```dart
+Text("text", textScaleFactor: 1.0)
+```
+
 [widget test](https://github.com/OpenFlutter/flutter_screenutil/issues/115)
 
 ### Example:

@@ -214,7 +214,8 @@ Column(
 
 #### 设置字体不随系统字体大小进行改变
 
-```
+APP全局:
+```dart
  MaterialApp(
         debugShowCheckedModeBanner: false,
         title: 'Flutter_ScreenUtil',
@@ -231,7 +232,10 @@ Column(
         home: HomePage(title: 'FlutterScreenUtil Demo'),
       ),
 ```
-
+单独的Text:
+```dart
+Text("text", textScaleFactor: 1.0)
+```
 
 [widget test](https://github.com/OpenFlutter/flutter_screenutil/issues/115)
 

@@ -368,6 +368,34 @@ class _HomePageState extends State<HomePage> {
 }
 
 ```
+
+#### Setting font does not change with system font size
+
+APP global:
+```
+ MaterialApp(
+        debugShowCheckedModeBanner: false,
+        title: 'Flutter_ScreenUtil',
+        theme: ThemeData(
+          primarySwatch: Colors.blue,
+        ),
+        builder: (context, widget) {
+          return MediaQuery(
+            ///Setting font does not change with system font size
+            data: MediaQuery.of(context).copyWith(textScaleFactor: 1.0),
+            child: widget,
+          );
+        },
+        home: HomePage(title: 'FlutterScreenUtil Demo'),
+      ),
+```
+
+Separate Text:
+```dart
+Text("text", textScaleFactor: 1.0)
+```
+
+
 [widget test](https://github.com/OpenFlutter/flutter_screenutil/issues/115)
 
 ### Exemplo:

@@ -4,7 +4,7 @@ version: 5.0.0
 homepage: https://github.com/OpenFlutter/flutter_screenutil
 
 environment:
-  sdk: '>=2.12.0-29.10.beta <3.0.0'
+  sdk: ">=2.12.0 <3.0.0"
 
 dependencies:
   flutter: