chore(package): update stylelint to version 7.2.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -64,7 +64,7 @@
     "postcss-mixins": "^5.0.1",
     "postcss-nested": "^1.0.0",
     "postcss-sorting": "^1.6.1",
-    "stylelint": "^7.1.0",
+    "stylelint": "^7.2.0",
     "stylelint-config-standard": "^13.0.0",
     "updtr": "^0.2.1"
   },