🐛 Fix invalid linter (#502)

analysis_options.yaml
```diff
- includes: package:flutter_lints/flutter.yaml
+ include: package:flutter_lints/flutter.yaml
```

Author: AmosHuKe

analysis_options.yaml

@@ -1,4 +1,4 @@
-includes: package:flutter_lints/flutter.yaml
+include: package:flutter_lints/flutter.yaml
 
 linter:
   rules:

example/lib/customs/pickers/insta_asset_picker.dart

@@ -6,6 +6,7 @@
 ///
 /// See the package https://github.com/LeGoffMael/insta_assets_picker
 /// for the complete implementations.
+library;
 
 import 'dart:math';
 

lib/src/delegates/asset_picker_builder_delegate.dart

@@ -1707,7 +1707,7 @@ class DefaultAssetPickerBuilderDelegate
 
   @override
   Widget pathEntitySelector(BuildContext context) {
-    Widget _text(
+    Widget pathText(
       BuildContext context,
       String text,
       String semanticsText,
@@ -1758,13 +1758,13 @@ class DefaultAssetPickerBuilderDelegate
                 mainAxisSize: MainAxisSize.min,
                 children: <Widget>[
                   if (path == null && isPermissionLimited)
-                    _text(
+                    pathText(
                       context,
                       textDelegate.changeAccessibleLimitedAssets,
                       semanticsTextDelegate.changeAccessibleLimitedAssets,
                     ),
                   if (path != null)
-                    _text(
+                    pathText(
                       context,
                       isPermissionLimited && path.isAll
                           ? textDelegate.accessiblePathName
@@ -1924,7 +1924,7 @@ class DefaultAssetPickerBuilderDelegate
 
   @override
   Widget previewButton(BuildContext context) {
-    Future<void> _onTap() async {
+    Future<void> onTap() async {
       final DefaultAssetPickerProvider p =
           context.read<DefaultAssetPickerProvider>();
       final List<AssetEntity> selectedAssets = p.selectedAssets;
@@ -1966,7 +1966,7 @@ class DefaultAssetPickerBuilderDelegate
       },
       child: Consumer<DefaultAssetPickerProvider>(
         builder: (_, DefaultAssetPickerProvider p, __) => GestureDetector(
-          onTap: p.isSelectedNotEmpty ? _onTap : null,
+          onTap: p.isSelectedNotEmpty ? onTap : null,
           child: Selector<DefaultAssetPickerProvider, String>(
             selector: (_, DefaultAssetPickerProvider p) =>
                 p.selectedDescriptions,

test/test_utils.dart

@@ -44,7 +44,8 @@ Widget defaultPickerTestApp({
 }
 
 class _DefaultHomePage extends StatelessWidget {
-  const _DefaultHomePage(this.onButtonPressed, {Key? key}) : super(key: key);
+  // ignore: unused_element
+  const _DefaultHomePage(this.onButtonPressed, {super.key});
 
   final void Function(BuildContext)? onButtonPressed;