Handle highlight.js deprecation

[nwhittaker]

Deprecated as of 10.7.0. highlight(lang, code, ...args) has been deprecated.
Deprecated as of 10.7.0. Please use highlight(code, options) instead.
highlightjs/highlight.js#2277

Seeing the above deprecation warning when running ember build in an app that depends on ember-cli-addon-docs.

I suspect it stems from this line:

ember-cli-addon-docs/addon/utils/compile-markdown.js

Line 67 in 35b8f7f

return hljs.getLanguage(lang) ? hljs.highlight(lang, code).value : code;