chore: quote stylelint file globs (#445)

Fix #444

Author: shsteimer

package.json

@@ -5,7 +5,7 @@
   "description": "Starter project for Adobe Helix",
   "scripts": {
     "lint:js": "eslint .",
-    "lint:css": "stylelint blocks/**/*.css styles/*.css",
+    "lint:css": "stylelint \"blocks/**/*.css\" \"styles/*.css\"",
     "lint": "npm run lint:js && npm run lint:css"
   },
   "repository": {