All caps words not getting capitalized

[Christilut]

Here are a few examples with incorrect output:

REMIX INTRO (Original Mix)
TEST STRING (Original Mix) (Feat. MC FOO)
VIBES! Feat. MC FOO
FOO! Feat. MC BAR
prologue the MAX (Original Mix)

Seems like maybe something like

	if (string.toUpperCase() === string) {
		string = string.toLowerCase();
	}

needs to be added to the capitalize() function?

Happy to make a PR, just wanted to check if someone will merge it.

[bdougherty]

Hmm, I don't think we can handle these without breaking the rules (last example, especially). The first could maybe work if each "container" was treated separately, but I'm not sure if that is a good idea.