Merge pull request #419 from textpattern/greenkeeper/stylelint-13.1.0

Update stylelint to the latest version 🚀

Author: philwareham

package.json

@@ -25,7 +25,7 @@
     "postcss-loader": "3.0.0",
     "sass": "1.24.4",
     "sass-loader": "8.0.0",
-    "stylelint": "12.0.1",
+    "stylelint": "13.1.0",
     "stylelint-order": "4.0.0",
     "stylelint-scss": "3.14.1",
     "stylelint-webpack-plugin": "1.2.3",