Get rid of all the library tags.

lib/src/version_constraint.dart

 // Copyright (c) 2014, 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_semver.src.version_constraint;
-
 import 'patterns.dart';
 import 'version.dart';
 import 'version_range.dart';
 import 'version_union.dart';
 
 /// A [VersionConstraint] is a predicate that can determine whether a given
 /// version is valid or not.
 ///
 /// For example, a ">= 2.0.0" constraint allows any version that is "2.0.0" or
 /// greater. Version objects themselves implement this to match a specific
@@ skipping 199 matching lines @@
   String toString() => '<empty>';
 }
 
 class _CompatibleWithVersionRange extends VersionRange {
   _CompatibleWithVersionRange(Version version) : super(
       min: version, includeMin: true,
       max: version.nextBreaking, includeMax: false);
 
   String toString() => '^$min';
 }