chore(package): update standard to version 9.0.2

Closes #7

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -35,6 +35,6 @@
     "json-stable-stringify": "^1.0.0",
     "mocha": "^3.0.0",
     "snazzy": "^6.0.0",
-    "standard": "^8.0.0"
+    "standard": "^9.0.2"
   }
 }