修改：修改状态栏颜色

Author: knoyo

example/lib/page/sample/user_profile.dart

@@ -21,6 +21,7 @@ class _UserProfilePageState extends State<UserProfilePage> {
           ),
           iconTheme: IconThemeData(color: Colors.white),
           elevation: 0.0,
+          brightness: Brightness.dark,
         ),
         body: Stack(
           children: <Widget>[