chore(package): update stylelint-webpack-plugin to version 1.2.3

Closes #559

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "stylelint": "12.0.1",
     "stylelint-order": "3.1.1",
     "stylelint-scss": "3.14.1",
-    "stylelint-webpack-plugin": "1.2.1",
+    "stylelint-webpack-plugin": "1.2.3",
     "webpack": "4.41.5",
     "webpack-cli": "3.3.10"
   },