Some highlighting is missing

[kgizdov]

Hi,

Thanks for a great extension.

However, it seems to be lacking some features. I've tested it with Monokai Extended and Seti_UX, even worked with the Seti_UX dev to bring better support, but it seems that it comes down to some missing highlighting capabilities in Markdown Extended.

As of now, when I open a file like this, there are several missing elements including, bot not limited to:

~~strikethrough~~

• [x] This is a complete item
• [ ] This is an incomplete item

:sparkles: :camel: :boom:

Have a look at the Markdown sample and see for yourself how it looks.

Regards.