Add @override annotations to flutter framework

packages/flutter_tools/lib/src/commands/build.dart

diff --git a/packages/flutter_tools/lib/src/commands/build.dart b/packages/flutter_tools/lib/src/commands/build.dart
index 04d80ce..54a5447 100644
--- a/packages/flutter_tools/lib/src/commands/build.dart
+++ b/packages/flutter_tools/lib/src/commands/build.dart
@@ -11,7 +11,10 @@
 import '../toolchain.dart';
 
 class BuildCommand extends FlutterCommand {
+  @override
   final String name = 'build';
+
+  @override
   final String description = 'Package your Flutter app into an FLX.';
 
   BuildCommand() {
@@ -42,6 +45,7 @@
     return await super.run();
   }
 
+  @override
   Future<int> runInProject() async {
     String compilerPath = argResults['compiler'];