Markdown url formatting gets escaped by closing parens in url

[ragesoss]

This isn't how markdown is supposed to be have, but if a url has a closing parens, then it will escape the url formatting at that point (instead at the closing parens as it should, to encapsulated the whole link).

[bmathews]

This is a bug in the markdown parser we're using, and it doesn't look like it'll be fixed/released anytime soon, despite there being open pull requests that fix it. markedjs/marked#109