Update eslint-plugin-node to the latest version 🚀 (#65)

* chore(package): update eslint-plugin-node to version 6.0.0

* chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

Author: greenkeeper[bot]

package-lock.json

@@ -39,7 +39,7 @@
     "eslint-config-semistandard": "~12.0.0",
     "eslint-config-standard": "~11.0.0-beta.0",
     "eslint-plugin-import": "^2.7.0",
-    "eslint-plugin-node": "^5.1.1",
+    "eslint-plugin-node": "^6.0.0",
     "eslint-plugin-promise": "~3.6.0",
     "eslint-plugin-react": "~7.6.0",
     "eslint-plugin-standard": "~3.0.1",