openLinksInNewWindow breaks _em_ markup

[andistuder]

When running the converter with openLinksInNewWindow set to true, it seems to break the conversion of the _underscore_ => <em>underscore</em> markup.

example string:
My [link](http://example.com) is _important_

when I convert it with openLinksInNewWindow set false, I receive (as expected):
<p>My <a href="http://example.com">link</a> is <em>important</em></p>

when I convert it with openLinksInNewWindow set true, I receive:
<p>My <a href="http://example.com">link</a> is _important_</p>
the word important no longer wrapped with the em tag.

Conversion of *star* => <em>star</em> works fine.

[tivie]

Verified

[tivie]

should be fixed now

[andistuder]

Much appreciated @tivie! When are you planning to merge this to master?

[tivie]

Soon. I'm planning the next release but wanted to merge #358 this PR that is dependent on creating a couple of tests. As soon as #358 is merged, a new showdown release will be published.

[andistuder]

Thanks for the quick fix @tivie - I can confirm that works for me!