title: Is there a way to pass a className to a component in react-markdown?
body: <p>I'm trying to pass a className to a component in react-markdown.</p>
  <p>For example,</p>
  <pre><code>&lt;ReactMarkdown source='test' /&gt;
  </code></pre>
  <p>Will result in</p>
  <pre><code>&lt;p&gt;test&lt;/p&gt;
  </code></pre>
  <p>How can I get to</p>
  <pre><code>&lt;p className='testClass'&gt;test&lt;/p&gt;
  </code></pre>