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Hi, Thank you for this PR. I'd like to test it on neovim before merging as soon as I get it to work (problems with $XDG_CONFIG_HOME)!

Hi, on master I did: ``` git bisect start git bisect bad git bisect good cfde385c024789ae34d0dd731869f0cc59cd9c4c ``` Tests are green on the aforementioned commit. I ran `npm test` for each...

Cool, it would be really great to have this :+1: Besides that I noticed hyper-markdown-preview isn't listed on the [awesome-hyper](https://github.com/bnb/awesome-hyper) page but it definitely should!