Add class into the li markup which contains checkbox

ParsedownCheckbox.php

@@ -10,7 +10,7 @@
 
 class ParsedownCheckbox extends ParsedownExtra
 {
-    const VERSION = '0.0.1';
+    const VERSION = '0.0.2';
 
     protected function blockListComplete($block)
     {
@@ -41,9 +41,11 @@ class ParsedownCheckbox extends ParsedownExtra
                 if ('[ ] ' === $begin_line) {
                     $block['element']['text'][$iterator_element]['text'][$iterator_text] = '<input type="checkbox" disabled /> '.
                         substr(trim($block['element']['text'][$iterator_element]['text'][$iterator_text]), 4);
+                    $block['element']['text'][$iterator_element]['attributes'] = ['class' => 'parsedown-task-list parsedown-task-list-open'];
                 } elseif ('[x] ' === $begin_line) {
                     $block['element']['text'][$iterator_element]['text'][$iterator_text] = '<input type="checkbox" checked disabled /> '.
                         substr(trim($block['element']['text'][$iterator_element]['text'][$iterator_text]), 4);
+                    $block['element']['text'][$iterator_element]['attributes'] = ['class' => 'parsedown-task-list parsedown-task-list-close'];
                 }
             }
         }

test/ParsedownCheckboxTest.php

@@ -16,12 +16,12 @@ EOF;
 
         $html = <<<EOF
 <ul>
-<li><input type="checkbox" disabled /> test 1</li>
+<li class="parsedown-task-list parsedown-task-list-open"><input type="checkbox" disabled /> test 1</li>
 <li>[] test 2</li>
-<li><input type="checkbox" checked disabled /> test 3
+<li class="parsedown-task-list parsedown-task-list-close"><input type="checkbox" checked disabled /> test 3
 <ul>
-<li><input type="checkbox" disabled /> test 4</li>
-<li><input type="checkbox" checked disabled /> test 5</li>
+<li class="parsedown-task-list parsedown-task-list-open"><input type="checkbox" disabled /> test 4</li>
+<li class="parsedown-task-list parsedown-task-list-close"><input type="checkbox" checked disabled /> test 5</li>
 </ul></li>
 <li><a href="https://markdown.org">test</a> 6</li>
 <li><a href="https://markdown.org">x</a> test 7</li>