title: Reactjs overide markdown types with react-markdown
body: <p>I am using contentful to get markdown to a react component that uses react-markdown to parse the markdown </p>
  
  <pre><code>import ReactMarkdown from 'react-markdown';
  
      &lt;Markdown source={text} /&gt;
  </code></pre>
  
  <p>Would I like to do is to override the Renderer so instead of it rendering ## as an h2 render i can pass a custom component to override the default h2 type to my own h2 component. How can i do that and is there and examples?</p>