Wrong parsing in comment

[KyleJeong]

I made this kind of python syntax highlighting codes in a markdown file.

Then this plugin thinks that the "# mod1.py" is a heading level 1. Can you skip that kind of syntax highlighting blocks?

# mod1.py
def add(a, b):
    return a + b

def sub(a, b):
    return a - b

[mzlogin]

OK, I'll look at it later.

Before this plugin is updated, you can use this kind of syntax as a workaround:

```python
print('hello')

[KyleJeong]

back-quote is working. Thank you for the quick feedback.

[mzlogin]

Fixed! You can try ~~~ syntax now.