support dio 5.4.0

example/lib/home_page.dart

@@ -4,9 +4,9 @@ import 'package:flutter/material.dart';
 import 'http_utils.dart';
 
 class MyHomePage extends StatefulWidget {
-  MyHomePage({Key key, this.title}) : super(key: key);
+  MyHomePage({Key? key, this.title}) : super(key: key);
 
-  final String title;
+  final String? title;
 
   @override
   _MyHomePageState createState() => _MyHomePageState();
@@ -33,7 +33,7 @@ class _MyHomePageState extends State<MyHomePage> {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text(widget.title),
+        title: Text(widget.title??""),
       ),
       body: Center(
         child: Column(

example/pubspec.yaml

@@ -18,7 +18,7 @@ description: example of dio log
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.1.0 <3.0.0"
+  sdk: '>=2.18.0-149.0.dev <3.0.0'
 
 dependencies:
   flutter:
@@ -27,7 +27,7 @@ dependencies:
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.1
-  dio: ^4.0.0
+  dio: ^5.4.3
 #  dio_log: 2.0.3
   dio_log: 
     path: ../../dio_log

pubspec.yaml

@@ -4,12 +4,12 @@ version: 2.0.4
 homepage: https://github.com/flutterplugin/dio_log
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: '>=2.18.0-149.0.dev <3.0.0'
 
 dependencies:
   flutter:
     sdk: flutter
-  dio: ^4.0.0
+  dio: ^5.4.3
 
 dev_dependencies: 
   flutter_test: