Hi, I am working on a website, and I realized, this app doesn' t recognize
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
I get:

error: Bad value “X-UA-Compatible” for attribute “http-equiv” on element “meta”.

but If validate the same page in:
https://html5.validator.nu/
it passes without warnings, which makes me assume that this project is running on an older version of the validator. if so, could it be possible to update it and release a new pip package.
I' m trying to integrate elixir-lang.org (https://github.com/elixir-lang/elixir-lang.github.com/) on travis, and I won' t be able to until this little issue is solve.
let me know if you need more input from my side,
thanks a lot, I use your project a lot to validate this website (but for the time being just locally)
cheers