chore(package): update stylelint-config-standard to version 20.0.0

Closes #215

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
     "properties-loader": "0.0.1",
     "style-loader": "^0.20.1",
     "stylelint": "^9.0.0",
-    "stylelint-config-standard": "^18.0.0",
+    "stylelint-config-standard": "^20.0.0",
     "stylelint-no-unsupported-browser-features": "^2.0.0",
     "transifex-loader": "^5.0.0",
     "underscore": "^1.8.3",