chore(package): update standard to version 7.1.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -39,6 +39,6 @@
     "yeoman-assert": "^2.0.0",
     "yeoman-test": "^1.0.0",
     "mocha": "^2.4.5",
-    "standard": "^6.0.8"
+    "standard": "^7.1.0"
   }
 }