chore(package): update standard to version 13.1.0

Closes #48

Author: greenkeeper[bot]

package.json

@@ -42,7 +42,7 @@
     "hiredis": "^0.5.0",
     "istanbul": "^0.4.0",
     "mocha": "^5.0.0",
-    "standard": "^11.0.1"
+    "standard": "^13.1.0"
   },
   "author": "Ruben Bridgewater",
   "license": "MIT",