Adjust pubspec for the package. Add a new test pointing users to the …

…example app.

packages/file_selector/file_selector_web/pubspec.yaml

@@ -16,15 +16,12 @@ dependencies:
     sdk: flutter
   flutter_web_plugins:
     sdk: flutter
-  meta: ^1.3.0-nullsafety.6
+  meta: ^1.3.0
 
 dev_dependencies:
   flutter_test:
     sdk: flutter
   pedantic: ^1.10.0
-  integration_test:
-    sdk: flutter
-  build_runner: ^1.10.0
 
 environment:
   sdk: '>=2.12.0-0 <3.0.0'

packages/file_selector/file_selector_web/test/more_tests_exist_elsewhere_test.dart

@@ -0,0 +1,10 @@
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  test('Tell the user where to find the real tests', () {
+    print('---');
+    print('This package also uses integration_test to run additional tests.');
+    print('See `example/README.md` for more info.');
+    print('---');
+  });
+}