Peer Headers with the second Header in a blockquote causes a bad section close

[LeviRosol]

That subject line probably makes little sense, so here's an example. If you put this in the jsfiddle in the readme, you'll see the bad output:

const src = `## Great stuff {.jumbotron}
lorem

___
> ## section 2
> click me {.btn .btn-default}`;

results in

<section class="jumbotron">

<h2 class="jumbotron">eat stuff</h2>

<p>lorem</p>

<hr>

<blockquote class="btn btn-default">

</section>

<section>

<h2>section 2</h2>

<p>click me</p>

</section>

</blockquote>

I'm going to make an attempt at fixing this and will submit a PR if I get it, but wanted to post here first incase you know a quick fix.

[arve0]

Thanks for reporting! I do not have a quick fix, so have a go

[LeviRosol]

Ok, i have a "fix" but am hung up on one thing. Currently this commit closes out the section before starting a blockquote, however, i'm getting an extra closing </section>

thoughts on preventing that?

WeWriteCode@57cf99b

[arve0]

I'm unsure if this is an easy fix. Take for example this

> block quote with
> # header
> qwerty

What should the expected output be? Maybe you can add what you expect to some cases?

[LeviRosol]

I needed to revisit this due to the bad HTML my changes were generating. I've since fixed the support for blockquotes, as well as enabled html in the test runner, and accounted for HTML blocks as well.

To be honest, I'm really not a fan of the code that it took to accomplish this, but in the end, it does seem to work well. I did add tests for all of the scenarios I had, and all are passing.

Feel free to pull from my fork / refactor / incorporate if you think there's value.