Issue when jumping from H2s to H3s

[timothymcmackin]

Here's my MD file, which I'm using with Jekyll:

---
title: Testing TOC
summary: Testing TOCs.
permalink: testTOC.html
---

Lorem ipsum.

### Here's an H3
Lorem ipsum.

## Here's an H2
Lorem ipsum.

### Here's an H3
Lorem ipsum.

## Here's an H2
Lorem ipsum.

The TOC output by toc.js isn't right:

<div id="toc">
  <ul>
    <li>
      <a href="#heres-an-h3">Here’s an H3</a><a href="#heres-an-h3"></a>
    </li>
  </ul>
  <li>
    <a href="#heres-an-h2">Here’s an H2</a><a href="#heres-an-h2"></a>
    <ul>
      <li>
        <a href="#heres-an-h3-1">Here’s an H3</a><a href="#heres-an-h3-1"></a>
      </li>
    </ul>
  </li>
  <li>
    <a href="#heres-an-h2-1">Here’s an H2</a><a href="#heres-an-h2-1"></a>
  </li>
</div>

You can see that the main <ul> is closed too early, causing the results to look wrong.