Inline elements don't parse across newlines

[duckwork]

When parsing Markdown, mistletoe doesn't parse inlines across line boundaries. Example source:

here is a file with *emph* and also
it will have *emph across
lines.*  uh-oh. Let's try **strong** and
also, of course, **strong across
lines.** uh-oh-uh-oh.

And example output:

<p>here is a file with <em>emph</em> and also
it will have *emph across
lines.*  uh-oh. Let&#x27;s try <strong>strong</strong> and
also, of course, **strong across
lines.** uh-oh-uh-oh.
</p>

Most parsers recognize inlines over newlines. It'd be nice if mistletoe did, too. Would it be as simple as setting a re flag?

[miyuchina]

Yeah, I added re.DOTALL flags across all the builtin token types. Some regexes also need to be changed, and there might be some performance implications, but CommonMark does it, so I'm keeping this feature.

Let me know if there's anything weird; I'll do a minor version release to pypi later. Thank you!

[duckwork]

Cool, thanks! I'm looking forward to the pypi release.

[miyuchina]

Just released it! Should be working in 0.5.4.