Markdown content gets escaped twice

[diagramatics]

Found this when working on #27. If you try with that content on line 18 you can see the apostrophes escaped to ' by metalsmith-markdown, then ' by metalsmith-prism.

Seems like the only way to make Prism not escape them is to use Prism's hooks and metalsmith-prism doesn't really have them exposed.

[phillipj]

After some digging I opened a PR in wernerglinka/metalsmith-prism#6 to avoid highlighting all together for inline code blocks where language is not specified. Seems like that would fix the issue of double escaping in these blog posts.

[fhemberger]

Thank you!

[phillipj]

Cant find any escaping issues after using the newly released metalsmith-prism 👯 Close this @fhemberger?

[fhemberger]

Yay, great! Thanks for looking after this issue.