title: NReco - wkhtmltopdf - Table of content(TOC) is not generating
body: <p>I am using wkhtmltopdf 0.12.5 with NReco (Asp.net core).
  I have set TOC to true</p>
  <pre><code>HtmlToPdf.GenerateToc = true;
  HtmlToPdf.TocHeaderText = &quot;INNEHÅLLSFÖRTECKNING&quot;;
  </code></pre>
  <p>I am getting document outline with the proper header text but toc is not generated.
  Am I missing anything?</p>