Bumped matcher version constraint

lib/html_enhanced_config.dart

 // Copyright (c) 2013, 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.
 
 /// A simple unit test library for running tests in a browser.
 ///
 /// Provides enhanced HTML output with collapsible group headers
 /// and other at-a-glance information about the test results.
 library unittest.html_enhanced_config;
 
@@ skipping 121 matching lines @@
       // handle the click event for the collapse all button
       te.querySelector('#btnCollapseAll').onClick.listen((_) {
         document
             .querySelectorAll('.unittest-row')
             .forEach((el) => el.attributes['class'] = el.attributes['class']
                 .replaceAll('unittest-row ', 'unittest-row-hidden '));
       });
 
       var previousGroup = '';
       var groupPassFail = true;
-      final indentAmount = 50;
 
       // order by group and sort numerically within each group
       var groupedBy = new LinkedHashMap<String, List<TestCase>>();
 
       for (final t in results) {
         if (!groupedBy.containsKey(t.currentGroup)) {
           groupedBy[t.currentGroup] = new List<TestCase>();
         }
 
         groupedBy[t.currentGroup].add(t);
@@ skipping 244 matching lines @@
 
   ''';
 }
 
 void useHtmlEnhancedConfiguration([bool isLayoutTest = false]) {
   unittestConfiguration = isLayoutTest ? _singletonLayout : _singletonNotLayout;
 }
 
 final _singletonLayout = new HtmlEnhancedConfiguration(true);
 final _singletonNotLayout = new HtmlEnhancedConfiguration(false);