chore(package): update stylelint to version 9.9.0

Author: greenkeeper[bot]

package.json

@@ -36,7 +36,7 @@
     "mini-css-extract-plugin": "0.4.5",
     "postcss-loader": "3.0.0",
     "sass-loader": "7.1.0",
-    "stylelint": "9.8.0",
+    "stylelint": "9.9.0",
     "stylelint-order": "2.0.0",
     "stylelint-scss": "3.4.0",
     "stylelint-webpack-plugin": "0.10.5",