Include supports-color as dependency

[Qix-]

Right now, we enable 256 colors if you have supports-color as a dependency. A few individuals have mentioned it should be included in the project dependencies, which sounds ideal.

The reason why we didn't (initially) do so is because we didn't want a minor/patch bump to introduce yet another dependency.

Thoughts?

[Jezorko]

I think it's better to give users a choice. Not everyone needs fancy colors. Also, how to add them is well explained in the README.

[Qix-]

@Jezorko Yeah I'm back and forth, but I mostly agree. A few times, though, people have complained about it - hence this ticket.

[Qix-]

I think there's going to be a better solution coming around the corner with #556, allowing users to opt-in to more colors. I want to get some more feedback from a few others regarding how that will work, but I think debug is already too big for what it does and adding supports-color will only exasperate the issue.

Closing in lieu of #556 (which indirectly solves this).

Thanks for the input @Jezorko.