chore(package): update standard to version 12.0.1

Closes #19

Author: greenkeeper[bot]

package.json

@@ -40,7 +40,7 @@
     "mocha": "^4.0.0",
     "prettier-standard": "^6.0.0",
     "semantic-release": "^7.0.1",
-    "standard": "^11.0.0"
+    "standard": "^12.0.1"
   },
   "lint-staged": {
     "linters": {