chore(package): update standard to version 13.1.0

Closes #7

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
     "ws": "^6.1.0"
   },
   "devDependencies": {
-    "standard": "^12.0.0",
+    "standard": "^13.1.0",
     "webpack": "^4.20.2",
     "webpack-cli": "^3.1.2"
   }