Merge pull request #2929 from webcompat/greenkeeper/stylelint-11.0.0

Update stylelint to the latest version 🚀

Author: Mike Taylor

package.json

@@ -49,7 +49,7 @@
     "postcss-import": "^12.0.0",
     "postcss-reporter": "^6.0.0",
     "postcss-url": "^8.0.0",
-    "stylelint": "^10.0.0",
+    "stylelint": "^11.0.0",
     "prettier": "1.18.0",
     "stylelint-config-standard": "^18.0.0",
     "stylelint-order": "^3.0.0",