Get rid of all the library tags.

lib/src/barback/excluding_aggregate_transformer.dart

Index: lib/src/barback/excluding_aggregate_transformer.dart
diff --git a/lib/src/barback/excluding_aggregate_transformer.dart b/lib/src/barback/excluding_aggregate_transformer.dart
index beed5ce776ce49873404297676f117ac55a641bd..412680121af6c87348890267b3a75b5514b70ae0 100644
--- a/lib/src/barback/excluding_aggregate_transformer.dart
+++ b/lib/src/barback/excluding_aggregate_transformer.dart
@@ -2,8 +2,6 @@
 // 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 pub.excluding_aggregate_transformer;
-
 import 'dart:async';
 
 import 'package:barback/barback.dart';