Prevent shading of specific filetypes

[andreadev-it]

Since this was a requested feature (by myself too!) I've decided to implement it.
Right now, it adds a config option "exclude_filetypes" that I've briefly documented in the README.
It's used like this:

require('shade').config({
    exclude_filetypes = { "neo-tree", ... }
})

I'm sorry if it's not the cleanest pull request ever, I've edited the README online, so there is an additional "merge" in there (also, I have nvim setup with 4 spaces indentation, so I needed to fix it in the last commit).

[par4m]

Looks like this project won't be maintained anymore, switched to your fork until this pr is merged.

[andreadev-it]

Hello @par4m, yes, there is no problem if you want. Just wanted to warn you that, since this was just for a pull request, I won't be maintaining this fork either. In the end, I had to stop using this plugin for various little quirks that it caused. I'm sad about it, because this was a very useful functionality!
If it works fine for you, then do it without worrying, I won't remove the repo until it's pulled (if it ever will) 👍🏼

[par4m]

Thanks for the efforts, its working seamingly well but just one major thing it's missing is disabling the plugin entirely when in a disabled filetype window.
e.g

It sucks that such a nice plugin isn't being maintained / no forks either.