a markdown document with tag <pre> can't convert into HTML!

What a terriable bug! The bug means that if a markdown document which will be converted into HTML can't use code chuck such as <pre> tag!

Prerequisites

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- Reproduced the problem in Safe Mode: https://flight-manual.atom.io/hacking-atom/sections/debugging/#using-safe-mode
- Followed all applicable steps in the debugging guide: https://flight-manual.atom.io/hacking-atom/sections/debugging/
- Checked the FAQs on the message board for common solutions: https://discuss.atom.io/c/faq
- Checked that your issue isn't already filed: https://github.com/issues?utf8=✓&q=is%3Aissue+user%3Aatom
- Checked that there is not already an Atom package that provides the described functionality: https://atom.io/packages

Description

I found that a markdown document with tag <pre> can preview correctly, but when I try to convert it into html, nothing happened.

I'm worried about the bug, because my markdown documents have many code examples and I have to convert the document into HTML.

Here are some examples:

<!-- if a markdown document have these contents, it can't convert into HTML -->

<pre></pre>

    line 1
    line 2

\```
example code
line 1
line 2
\```

\```lua
print("What a terrable bug!")
\```

I think you know the meaning about \```.

Steps to Reproduce

Expected behavior:
Actual behavior:
Reproduces how often:

atom / markdown-preview