update standard to version 8.1.0 (#6)

Author: jescalan

package.json

@@ -11,7 +11,7 @@
     "ava": "^0.16.0",
     "coveralls": "2.x",
     "nyc": "8.3.0",
-    "standard": "8.0.0",
+    "standard": "8.1.0",
     "webpack": "^1.13.0"
   },
   "engines": {