chore(package): update standard to version 13.0.2

Closes #38

Author: greenkeeper[bot]

package.json

@@ -27,7 +27,7 @@
   "devDependencies": {
     "coveralls": "^3.0.1",
     "nyc": "12.0.2",
-    "standard": "^11.0.1",
+    "standard": "^13.0.2",
     "tape": "^4.9.0"
   },
   "repository": {