Unable to run in node when using markdown

[Mister-Hope]

See 2b355c9#diff-12f505384949e8ade50a6337e923bbe2ac037b951fb003617889a165758b4d3c

This commit and other commit include document, then it makes prism unable to run under node environment.

This is absolutly a breaking change in prismjs, and should be consider as a bug.

[RunDevelopment]

Thanks for the report @Mister-Hope! Will fix asap

l

https://github.com/atom-material/atom-material-syntax/issues/46#issue-190180050 #2975