chore(package): update stylelint to version 11.1.1

Closes #24

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
   "license": "MIT",
   "devDependencies": {
     "jest": "^20.0.4",
-    "stylelint": "^10.0.0",
+    "stylelint": "^11.1.1",
     "stylelint-config-standard": "17.0.0"
   }
 }