Feature request: Add support for 'mermaid' diagrams and charts

[vbspam]

I would like to ask you to add support for Mermaid (https://mermaidjs.github.io/) diagrams and charts.

Even though I am not JS expert, I can imagine I could add such support by myself. It however require to alter the client side rendering which in in the plugin provided only in minified version (file markdown.tar.gz).

Would you please consider to add this Mermaid support or at least provide the JS sources?