[wifi_info_flutter] null safety stable (#3627)

diff --git a/packages/wifi_info_flutter/wifi_info_flutter/CHANGELOG.md b/packages/wifi_info_flutter/wifi_info_flutter/CHANGELOG.md
index c98140e..c76009e 100644
--- a/packages/wifi_info_flutter/wifi_info_flutter/CHANGELOG.md
+++ b/packages/wifi_info_flutter/wifi_info_flutter/CHANGELOG.md

@@ -1,4 +1,4 @@
-## 2.0.0-nullsafety
+## 2.0.0
 
 * Migrate to null safety.
 

diff --git a/packages/wifi_info_flutter/wifi_info_flutter/example/lib/main.dart b/packages/wifi_info_flutter/wifi_info_flutter/example/lib/main.dart
index 8c64c5d..b92e550 100644
--- a/packages/wifi_info_flutter/wifi_info_flutter/example/lib/main.dart
+++ b/packages/wifi_info_flutter/wifi_info_flutter/example/lib/main.dart

@@ -42,7 +42,7 @@
 }
 
 class MyHomePage extends StatefulWidget {
-  MyHomePage({Key key, this.title}) : super(key: key);
+  MyHomePage({Key? key, required this.title}) : super(key: key);
 
   final String title;
 
@@ -54,7 +54,7 @@
   String _connectionStatus = 'Unknown';
   final Connectivity _connectivity = Connectivity();
   final WifiInfo _wifiInfo = WifiInfo();
-  StreamSubscription<ConnectivityResult> _connectivitySubscription;
+  late StreamSubscription<ConnectivityResult> _connectivitySubscription;
 
   @override
   void initState() {
@@ -72,7 +72,7 @@
 
   // Platform messages are asynchronous, so we initialize in an async method.
   Future<void> initConnectivity() async {
-    ConnectivityResult result;
+    late ConnectivityResult result;
     // Platform messages may fail, so we use a try/catch PlatformException.
     try {
       result = await _connectivity.checkConnectivity();
@@ -103,7 +103,7 @@
   Future<void> _updateConnectionStatus(ConnectivityResult result) async {
     switch (result) {
       case ConnectivityResult.wifi:
-        String wifiName, wifiBSSID, wifiIP;
+        String? wifiName, wifiBSSID, wifiIP;
 
         try {
           if (!kIsWeb && Platform.isIOS) {

diff --git a/packages/wifi_info_flutter/wifi_info_flutter/example/pubspec.yaml b/packages/wifi_info_flutter/wifi_info_flutter/example/pubspec.yaml
index 0f0adbf..bd42485 100644
--- a/packages/wifi_info_flutter/wifi_info_flutter/example/pubspec.yaml
+++ b/packages/wifi_info_flutter/wifi_info_flutter/example/pubspec.yaml

@@ -3,10 +3,10 @@
 publish_to: 'none'
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
+  sdk: ">=2.12.0-259.9.beta <3.0.0"
 
 dependencies:
-  connectivity: 0.4.9+3
+  connectivity: ^3.0.0
   flutter:
     sdk: flutter
   wifi_info_flutter:
@@ -16,7 +16,6 @@
     # The example app is bundled with the plugin so we use a path dependency on
     # the parent directory to use the current plugin's version.
     path: ../
-  cupertino_icons: ^1.0.0
 
 dev_dependencies:
   integration_test:

diff --git a/packages/wifi_info_flutter/wifi_info_flutter/example/test_driver/integration_test/wifi_info_test.dart b/packages/wifi_info_flutter/wifi_info_flutter/example/test_driver/integration_test/wifi_info_test.dart
index 103dc54..6fe4737 100644
--- a/packages/wifi_info_flutter/wifi_info_flutter/example/test_driver/integration_test/wifi_info_test.dart
+++ b/packages/wifi_info_flutter/wifi_info_flutter/example/test_driver/integration_test/wifi_info_test.dart

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.9
 import 'dart:io';
 import 'package:integration_test/integration_test.dart';
 import 'package:flutter_test/flutter_test.dart';

diff --git a/packages/wifi_info_flutter/wifi_info_flutter/example/test_driver/test/integration_test.dart b/packages/wifi_info_flutter/wifi_info_flutter/example/test_driver/test/integration_test.dart
index 8a77ec8..d59272c 100644
--- a/packages/wifi_info_flutter/wifi_info_flutter/example/test_driver/test/integration_test.dart
+++ b/packages/wifi_info_flutter/wifi_info_flutter/example/test_driver/test/integration_test.dart

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.9
 import 'dart:convert';
 import 'dart:io';
 import 'package:flutter_driver/flutter_driver.dart';

diff --git a/packages/wifi_info_flutter/wifi_info_flutter/pubspec.yaml b/packages/wifi_info_flutter/wifi_info_flutter/pubspec.yaml
index 0fbc278..7b58d48 100644
--- a/packages/wifi_info_flutter/wifi_info_flutter/pubspec.yaml
+++ b/packages/wifi_info_flutter/wifi_info_flutter/pubspec.yaml

@@ -1,16 +1,16 @@
 name: wifi_info_flutter
 description: A new flutter plugin project.
-version: 2.0.0-nullsafety
 homepage: https://github.com/flutter/plugins/tree/master/packages/wifi_info_flutter/wifi_info_flutter
+version: 2.0.0
 
 environment:
-  sdk: ">=2.12.0-0 <3.0.0"
+  sdk: ">=2.12.0-259.9.beta <3.0.0"
   flutter: ">=1.20.0"
 
 dependencies:
   flutter:
     sdk: flutter
-  wifi_info_flutter_platform_interface: ^2.0.0-nullsafety
+  wifi_info_flutter_platform_interface: ^2.0.0
 
 dev_dependencies:
   integration_test: