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

Closes #86

Author: greenkeeper[bot]

package.json

@@ -110,7 +110,7 @@
     "stylelint": "~9.10.1",
     "stylelint-config-prettier": "^4.0.0",
     "stylelint-config-recommended-scss": "~3.2.0",
-    "stylelint-config-standard": "~18.2.0",
+    "stylelint-config-standard": "~20.0.0",
     "stylelint-scss": "^3.9.1",
     "ts-node": "^8.3.0",
     "tslint": "~5.12.1",