chore: add runkit example, part III

Author: joscha

runkitExample.js

@@ -1,10 +1,9 @@
 const detective = require('detective-postcss');
 
-// list of imported file names (ex: 'bla.css', 'foo.css', etc.)
-const content = `
+const css = `
     .my_class {
         background: url("myFile.png");
     }`;
 
 // or to also detect any url() references to images, fonts, etc.
-const allDependencies = detective(content, { url: true });
+const allDependencies = detective(css, { url: true });