Get rid of all the library tags.

lib/src/patterns.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.patterns;
-
 /// Regex that matches a version number at the beginning of a string.
 final START_VERSION = new RegExp(
     r'^'                                        // Start at beginning.
     r'(\d+).(\d+).(\d+)'                        // Version number.
     r'(-([0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*))?'    // Pre-release.
     r'(\+([0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*))?'); // Build.
 
 /// Like [START_VERSION] but matches the entire string.
 final COMPLETE_VERSION = new RegExp(START_VERSION.pattern + r'$');
 
 /// Parses a comparison operator ("<", ">", "<=", or ">=") at the beginning of
 /// a string.
 final START_COMPARISON = new RegExp(r"^[<>]=?");
 
 /// The "compatible with" operator.
 const COMPATIBLE_WITH = "^";