nicojs
We should add a direct dev-dependency to the [commonmark spec](https://github.com/jgm/CommonMark). During every build we should regenerate the test cases from it. That way, it is far easier to not get out-sync with the spec. Right now, we are a little bit out-sync with the latest tests. At first, we should target a specific version of the spec, as we do not want to update the tests in the PR for this issue.