chore(package): update eslint-plugin-standard to version 2.1.0 (#1027)

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
     "eslint": "~3.16.0",
     "eslint-config-standard": "~7.0.0",
     "eslint-plugin-promise": "~3.5.0",
-    "eslint-plugin-standard": "~2.0.1",
+    "eslint-plugin-standard": "~2.1.0",
     "istanbul": "~0.4.5",
     "mocha": "~3.2.0",
     "utf-8-validate": "~3.0.0"