Fix possible file limit errors

As we currently may need higher nofile limits than usual/default on
various systems this commit should probide a fix for that an allow to
build HackMD without highering these limits and increase security.

Inspiration was found in a copy-webpack-plugin-issue[1] and found by
@thegcat[2]. Thanks for that!

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

[1]:
https://github.com/webpack-contrib/copy-webpack-plugin/issues/59#issuecomment-228563990
[2]: https://github.com/thegcat

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