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

Closes #6

Author: greenkeeper[bot]

package.json

@@ -24,7 +24,7 @@
     "probot-scheduler": "^1.2.0",
     "stylelint": "^9.9.0",
     "stylelint-config-recommended": "^2.1.0",
-    "stylelint-config-standard": "^18.2.0",
+    "stylelint-config-standard": "^20.0.0",
     "uuid": "^3.3.2"
   },
   "engines": {