anchorPattern matches inner parens pairs #12
Description
Just noticed that anchorPattern is seemingly supposed to match [title][anchor]-style links while anchorInlinePattern matches [title](http://example.com)-style links.
Still, anchorPattern uses parenRegex to match round parens on its inside.
Thinking about it, I would simply remove that part. Was there an edge case you wanted to handle with that code, @macteo? If so, I'll write tests for that case to make sure that no refactoring breaks the existing stuff.