To #678: add support for double equals highlight.

[jian-ke]

[jian-ke]

support for == highlight.

[Tweekism]

Hey ckmufeng,

Looks like iamcco isn't maintaining this one any more. I'm going to try and collect up some of these patches on my repo if you'd like to send a PR over there? at least until he is back...

Tweekism/markdown-preview.nvim

[Tweekism]

Unless someone is willing to put in the effort to revive this project I don't think chances are good to get this added. I've decided for now not to persue reviving this and am moving over to Vivify instead. These guys are also previous users of this extension.