Added Dart Sass

Author: robneu

config/grunt/sass.js

@@ -1,6 +1,9 @@
 // https://github.com/sindresorhus/grunt-sass
+const sass = require( 'sass' );
+
 module.exports = {
 	options: {
+		implementation: sass,
 		sourceMap: true,
 		outputStyle: 'expanded',
 		indentType: 'tab',

package.json

@@ -41,6 +41,7 @@
     "grunt-version": "1.x",
     "grunt-wp-i18n": "1.x",
     "postcss-pxtorem": "4.x",
-    "time-grunt": "1.x"
+    "time-grunt": "1.x",
+    "sass": "1.x"
   }
 }