Bad HTML if titles contains quote

[pboesch]

Hi,

An issue with quote: if a title of table of content contains quote, the html code generates is broken.

For example:

Title: this is test
Date: 2019

# with english h1
## and again english h2
### i'll show you now

html:

   <div id="toc"><ul><li><a class="toc-href" href="#with-english-h1" title="with english h1">with english h1</a><ul><li><a class="toc-href" href="#and-again-english-h2" title="and again english h2">and again english h2</a><ul><li><a class="toc-href" href="#ill-show-you-now" ll="" now'="" show="" title="i" you="">i'll show you now</a></li></ul></li></ul></li></ul></div>

See? string after quote becomes a html tag.

<a class="toc-href" href="#ill-show-you-now" ll="" now'="" show="" title="i" you="">i'll show you now</a>

with extract_toc no issue (but no title tag)

If you have any questions...
Thanks!