Check for custom properties in no-color-keywords

Author: DanPurdy

lib/rules/no-color-keywords.js

@@ -16,7 +16,7 @@ var cssColors = yaml.safeLoad(fs.readFileSync(path.join(__dirname, '../../data',
  */
 var checkValidParentType = function (node) {
   if (node) {
-    return node.type === 'function' || node.type === 'variable';
+    return node.type === 'function' || node.type === 'variable' || node.type === 'customProperty';
   }
 
   return false;

tests/sass/no-color-keywords.sass

@@ -31,3 +31,5 @@ $other: rgba($blue, 0.3)
 
 // Issue #717 - rule trips over Sass color function names
 $colors: ( 'red': red($color), 'green': green($color), 'blue': blue($color) )
+
+$badge-bg: var(--red)

tests/sass/no-color-keywords.scss

@@ -42,3 +42,5 @@ $colors: (
   'green': green($color),
   'blue': blue($color)
 );
+
+$badge-bg: var(--red);