chore(package): update eslint-plugin-node to version 9.0.1

Closes #419

Author: greenkeeper[bot]

package.json

@@ -51,7 +51,7 @@
     "eslint": "4.18.1",
     "eslint-plugin-import": "2.10.0",
     "eslint-config-standard": "11.0.0",
-    "eslint-plugin-node": "6.0.1",
+    "eslint-plugin-node": "9.0.1",
     "eslint-plugin-promise": "3.7.0",
     "eslint-plugin-standard": "3.0.1",
     "jscpd": "0.6.17",