Modernize the package's style.

lib/src/result/future.dart

Index: lib/src/result/future.dart
diff --git a/lib/src/result_future.dart b/lib/src/result/future.dart
similarity index 94%
rename from lib/src/result_future.dart
rename to lib/src/result/future.dart
index 311e83fece833242de36dd3bfad4c473c8c3c929..db9dd822c112883fe93d7ab08279c1b0c7939a8d 100644
--- a/lib/src/result_future.dart
+++ b/lib/src/result/future.dart
@@ -2,12 +2,10 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library async.result_future;
-
 import 'dart:async';
 
+import '../delegate/future.dart';
 import '../result.dart';
-import 'delegate/future.dart';
 
 /// A [Future] wrapper that provides synchronous access to the result of the
 /// wrapped [Future] once it's completed.