chore(package): update standard to version 12.0.1

Closes #81

Author: greenkeeper[bot]

package.json

@@ -42,7 +42,7 @@
     "rimraf": "^2.6.1",
     "sinon": "^6.1.5",
     "sinon-chai": "^3.2.0",
-    "standard": "^10.0.0"
+    "standard": "^12.0.1"
   },
   "main": "lib/index.js",
   "files": [