Use latest commonmarker
Use latest commonmarker

The APi breakage was "fixed" in tilt
as https://github.com/rtomayko/tilt/issues/319,
effectively breaking commonmarker support in 0.19.2 and 0.19.3.

This fixes it by using the new version of the commonmarker gem again.

marrero984/showoff,binford2k/showoff,marrero984/showoff,binford2k/showoff,puppetlabs/showoff,marrero984/showoff,binford2k/showoff,binford2k/showoff,puppetlabs/showoff,marrero984/showoff,puppetlabs/showoff,puppetlabs/showoff