Wrongly parsed code blocks as markdown

[AlynxZhou]

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Description

If you have a code block in your markdown file, and the code has chars like *, it will be process as a part of markdown, however, I think code blocks are just code and you shouldn't process * in code as italic, I just want to define a pointer in C...

Steps to Reproduce

1. Create a markdown file.
2. Create a code block with c because we are going to write C code.
3. Insert some code like int *ptr = NULL; and see code after * becomes italic and breaks highlighting.

Reproduces how often: Every time.

Versions

Atom    : 1.30.0
Electron: 2.0.9
Chrome  : 61.0.3163.100
Node    : 8.9.3

apm  2.1.2
npm  6.4.1
node 10.11.0 x64
atom 1.30.0
python 2.7.15
git 2.19.0

[rsese]

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We noticed that this looks like a duplicate of https://github.com/atom/language-gfm/issues/44 so you can subscribe there for updates if you'd like.

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