chore(package): update stylelint to version 11.1.0

Closes #461

Author: greenkeeper[bot]

package.json

@@ -59,7 +59,7 @@
     "react-router-dom": "^4.2.2",
     "react-test-renderer": "^16.3.2",
     "standard": "^11.0.1",
-    "stylelint": "^9.2.0",
+    "stylelint": "^11.1.0",
     "stylelint-config-recommended-scss": "^3.2.0",
     "stylelint-config-standard": "^18.2.0",
     "stylelint-scss": "^3.0.1",