Get rid of all the library tags.

lib/src/command/version.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // 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.command.version;
-
 import '../command.dart';
 import '../log.dart' as log;
 import '../sdk.dart' as sdk;
 
 /// Handles the `version` pub command.
 class VersionCommand extends PubCommand {
   String get name => "version";
   String get description => "Print pub version.";
   String get invocation => "pub version";
 
   void run() {
     log.message("Pub ${sdk.version}");
   }
 }