chore(package): update eslint-plugin-node to version 9.0.0

Closes #66

Author: greenkeeper[bot]

package.json

@@ -49,7 +49,7 @@
     "eslint": "5.0.1",
     "eslint-config-standard": "11.0.0",
     "eslint-plugin-import": "2.12.0",
-    "eslint-plugin-node": "6.0.1",
+    "eslint-plugin-node": "9.0.0",
     "eslint-plugin-promise": "4.0.0",
     "eslint-plugin-standard": "4.0.0",
     "jscpd": "0.6.22",