bug with color name in url, no ignore image name

[alexander-akait]

const colorguard = require('colorguard');

colorguard.process('a {\n  background-image: url(../images/white.png);\n  color: #fff;\n}').then((result) => {
    console.log(result);
});

<input css 1>
  line 3  col 3  #fff collides with white  (2:34)

  ✖  1 collision found.

[apexskier]

It looks like this is due to pipetteur parsing colors without respect to where they are located. A rule that would avoid this issue is to not parse colors within url()s. I think that's the only place where you'd see this happen.