chore(package): update standard to version 13.1.0

Closes #51

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
     "nodemon": "^1.19.1",
     "pre-commit": "^1.2.2",
     "sinon": "^7.3.2",
-    "standard": "^12.0.1",
+    "standard": "^13.1.0",
     "text-encoding": "^0.7.0"
   },
   "standard": {