title: Doc file corrupted when special charter is being submited in PHPForm
body: <p>I have a form where user are filling questionnaire , When they submit special characters The doc created is corrupted</p>
  
  <p>How can I fix this</p>
  
  <p>My code </p>
  
  <pre><code>require_once 'src/PhpWord/Autoloader.php';
              \PhpOffice\PhpWord\Autoloader::register();
  
              if(isset($_POST['submit_docs'])){
              $companyname= $_POST['companyname'];
                          // Creating the new document...
              $phpWord = new \PhpOffice\PhpWord\PhpWord();
                          // Adding an empty Section to the document...
              $section = $phpWord-&gt;addSection();
  
                          $html .= '&lt;ul&gt;&lt;li&gt;Company Name and Address : '.$_POST["companyname"].' &lt;/li&gt;&lt;/ul&gt;';
                                      \PhpOffice\PhpWord\Shared\Html::addHtml($section, $html);
              $objWriter = \PhpOffice\PhpWord\IOFactory::createWriter($phpWord, 'Word2007');
              $objWriter-&gt;save('questionnaire/DMKSA_Questionnaire_'.$arr[0].'.docx');
  </code></pre>
  
  <p>Error</p>
  
  <pre><code>Warning: DOMDocument::loadXML(): StartTag: invalid element name in Entity, line: 1 in /home/xxxx/public_html/test/src/PhpWord/Shared/Html.php
  </code></pre>
  
  <p>This happens only when special characters like '&lt;' is being submitted</p>
  
  <p>Any leads on this 
  Thanks </p>