Return A11y score as text?

[jameschetwood]

It would be great if this library could return the colour contrast score in text eg how this other library works:

https://github.com/tmcw/wcag-contrast#score
score(10); // = 'AAA'

Currently you would need to use the isReadable function to return booleans and manually workout the text score, right?

const aaa = colord("#e60000").isReadable("#ffff47", { level: "AAA" }); // false
const aaaLarge = colord("#e60000").isReadable("#ffff47", { level: "AAA", size: "large" }); // true 

if(aaa) return 'AAA'
if(aaaLarge) return 'AAA large'
return 'FAIL'