Considere to upgrade to Vuedoc Markdown 3.0.0

[demsking]

Just to notice you that the Vuedoc Markdown 3.0.0 has been release on NPM which bring important features and changes.
It would be great to consider to upgrade jsdoc-vuedoc dependencies.

NPM: https://www.npmjs.com/package/@vuedoc/md/v/3.0.0-beta2