Fix linting issues and add Sponsoring

Author: bdlukaa

README.md

@@ -70,10 +70,14 @@ Use the getter `SystemTheme.isDarkMode` to check if the device is in dark mode.
 final darkMode = SystemTheme.darkMode;
 ```
 
-# Contribution
+## Sponsoring
+
+<a href="https://www.patreon.com/bePatron?u=50324277" data-patreon-widget-type="become-patron-button">Become a Patron!</a><script async src="https://c6.patreon.com/becomePatronButton.bundle.js"></script>
+
+## Contribution
 
 Feel free to [open an issue](https://github.com/bdlukaa/system_theme/issues/new) if you find an error or [make pull requests](https://github.com/bdlukaa/system_theme/pulls).
 
-## Acknowlegments
+### Acknowlegments
 
 - [@alexmercerind](https://github.com/alexmercerind) for the Windows implementation

example/lib/main.dart

@@ -4,10 +4,12 @@ import 'package:system_theme/system_theme.dart';
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
   await SystemTheme.accentColor.load();
-  runApp(MaterialApp(home: MyApp()));
+  runApp(const MaterialApp(home: MyApp()));
 }
 
 class MyApp extends StatefulWidget {
+  const MyApp({Key? key}) : super(key: key);
+
   @override
   _MyAppState createState() => _MyAppState();
 }
@@ -16,7 +18,7 @@ class _MyAppState extends State<MyApp> {
   @override
   void initState() {
     super.initState();
-    print(SystemTheme.accentColor.accent);
+    debugPrint(SystemTheme.accentColor.accent.toString());
   }
 
   @override

example/pubspec.lock

@@ -55,6 +55,13 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_lints:
+    dependency: "direct dev"
+    description:
+      name: flutter_lints
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.4"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -72,6 +79,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.6.3"
+  lints:
+    dependency: transitive
+    description:
+      name: lints
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.1"
   matcher:
     dependency: transitive
     description:

example/pubspec.yaml

@@ -17,6 +17,7 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
+  flutter_lints: ^1.0.4
 
 flutter:
   uses-material-design: true