chore(deps): update dependency eslint-plugin-node to v9 (#352)

Author: renovate[bot]

package.json

@@ -81,7 +81,7 @@
     "delay": "^4.1.0",
     "eslint": "^5.0.0",
     "eslint-config-prettier": "^4.0.0",
-    "eslint-plugin-node": "^8.0.0",
+    "eslint-plugin-node": "^9.0.0",
     "eslint-plugin-prettier": "^3.0.0",
     "express": "^4.16.3",
     "gts": "^0.9.0",