title: React Helmet not updating meta title tag
body: <p>I've been setting my react.js SPA's page titles by doing:</p>
  
  <pre><code>document.title = {some title}
  </code></pre>
  
  <p>...so far and it worked fine. Now, I also wanted to update the <code>meta</code> <code>title</code> tag and so I installed <a href="https://github.com/nfl/react-helmet" rel="noreferrer">react-helmet</a>.<br>
  In my component, I've imported <code>Helmet</code> from the library and did:</p>
  
  <pre><code>render() {
    {/* ... */}
    return (
      &lt;div&gt;
        &lt;Helmet&gt;
          &lt;title&gt;{docTitle}&lt;/title&gt;
          &lt;meta name="title" content={docTitle} /&gt;
        &lt;/Helmet&gt;
        {/* ... */}
      &lt;/div&gt;
    )
  }
  </code></pre>
  
  <p>When opening the page, I saw that the document title is properly updated, but when inspecting the elements in the browser, I noticed that <code>&lt;meta name="title"</code> is not being updated, while a few lines down, <code>&lt;title&gt;</code> <em>is</em> updated.</p>
  
  <p>What am I doing wrong here?</p>