chore(package): update sass to version 1.26.0

Author: greenkeeper[bot]

package.json

@@ -39,7 +39,7 @@
     "grunt-sass": "3.1.0",
     "grunt-stylelint": "0.14.0",
     "load-grunt-tasks": "5.1.0",
-    "sass": "1.24.4",
+    "sass": "1.26.0",
     "stylelint": "13.2.0",
     "stylelint-order": "4.0.0",
     "stylelint-scss": "3.14.2",