bump lints dep and fix (#275)

Author: kevmoo

lib/async.dart

@@ -6,7 +6,7 @@
 /// library.
 ///
 /// {@youtube 560 315 https://www.youtube.com/watch?v=r0tHiCjW2w0}
-library async;
+library;
 
 export 'src/async_cache.dart';
 export 'src/async_memoizer.dart';

pubspec.yaml

@@ -11,7 +11,7 @@ dependencies:
   meta: ^1.1.7
 
 dev_dependencies:
-  dart_flutter_team_lints: ^2.0.0
+  dart_flutter_team_lints: ^3.0.0
   fake_async: ^1.2.0
   stack_trace: ^1.10.0
   test: ^1.16.0

test/io_sink_impl.dart

@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 @Deprecated('Tests deprecated functionality')
-library io_sink_impl;
+library;
 
 import 'dart:io';
 

test/sink_base_test.dart

@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 @Deprecated('Tests deprecated functionality')
-library sink_base_test;
+library;
 
 import 'dart:async';
 import 'dart:convert';