[Bug] We have to use '\' to add the '('

Notice that we have to add '' in front of "(", otherwises this won't be analyzed out.

The original words are in the attached sample:
Sample.txt.

For more，please refer to：nodejs/nodejs.org#2119

[styfle]

@Maledong Thanks for reporting this bug!

Here's a smaller repro steps:

[One](https://example.com/1) ([Two](https://example.com/2)) [Three](https://example.com/3)

marked demo

/cc @UziTech looks like a regression in 0.6.1 because it works fine in 0.6.0

[UziTech]

this is fixed in #1435

demo

Thanks! A very quick fixture, waiting for your publishment :)