Promote null safety

CHANGELOG.md

@@ -1,5 +1,5 @@
-## 3.0.0-nullsafety.4
-Adds null safety support (pre-release) ([#510](https://github.com/miguelpruivo/flutter_file_picker/issues/510)).
+## 3.0.0
+Adds null safety support ([#510](https://github.com/miguelpruivo/flutter_file_picker/issues/510)).
 ## 2.1.7
 ### iOS
 - Fixes an issue where a crash could happen when picking a lot of media files in low memory devices ([#606](https://github.com/miguelpruivo/flutter_file_picker/issues/606)).

example/lib/generated_plugin_registrant.dart

@@ -2,15 +2,14 @@
 // Generated file. Do not edit.
 //
 
-// ignore: unused_import
-import 'dart:ui';
+// ignore_for_file: lines_longer_than_80_chars
 
 import 'package:file_picker/src/file_picker_web.dart';
 
 import 'package:flutter_web_plugins/flutter_web_plugins.dart';
 
 // ignore: public_member_api_docs
-void registerPlugins(PluginRegistry registry) {
-  FilePickerWeb.registerWith(registry.registrarFor(FilePickerWeb));
-  registry.registerMessageHandler();
+void registerPlugins(Registrar registrar) {
+  FilePickerWeb.registerWith(registrar);
+  registrar.registerMessageHandler();
 }

pubspec.yaml

@@ -1,7 +1,7 @@
 name: file_picker
 description: A package that allows you to use a native file explorer to pick single or multiple absolute file paths, with extension filtering support.
 homepage: https://github.com/miguelpruivo/plugins_flutter_file_picker
-version: 3.0.0-nullsafety.4
+version: 3.0.0
 
 dependencies:
   flutter:
@@ -9,13 +9,13 @@ dependencies:
   flutter_web_plugins:
     sdk: flutter
     
-  flutter_plugin_android_lifecycle: ^2.0.0-nullsafety
+  flutter_plugin_android_lifecycle: ^2.0.0
   plugin_platform_interface: ^2.0.0
 
 environment:
   sdk: ">=2.12.0 <3.0.0"
-  flutter: ">=1.10.0 <2.0.0"
-
+  flutter: ">=1.10.0"
+  
 flutter:
   plugin:
     platforms: