chore(package): update stylelint-webpack-plugin to version 1.2.0

Author: greenkeeper[bot]

package.json

@@ -28,7 +28,7 @@
     "stylelint": "12.0.1",
     "stylelint-order": "4.0.0",
     "stylelint-scss": "3.13.0",
-    "stylelint-webpack-plugin": "1.1.2",
+    "stylelint-webpack-plugin": "1.2.0",
     "webpack": "4.41.5",
     "webpack-cli": "3.3.10"
   },