fix(package): update eslint-plugin-node to version 8.0.0

Closes #9

Author: greenkeeper[bot]

package.json

@@ -15,7 +15,7 @@
     "eslint-config-airbnb-base": "^11.2.0",
     "eslint-config-standard": "^10.2.1",
     "eslint-plugin-import": "^2.7.0",
-    "eslint-plugin-node": "^5.1.0",
+    "eslint-plugin-node": "^8.0.0",
     "eslint-plugin-promise": "^3.5.0",
     "eslint-plugin-standard": "^3.0.1"
   },