How do I make a flowchart using markdown on my github blog : <p>I recently put some posts on my github jekyll blog.Everything is fine,except my flowchart.I used to make flowchart like this:</p>

<pre><code>```flow
my content
```
</code></pre>

<p>but when I preview the post,It can't display as a flowchart.
This is Ok in some other markdown editor.If I want to make flowchart on my github blog,what can I do?Thanks.</p>
