chore(package): update eslint-plugin-node to version 6.0.0 (#14)

Author: greenkeeper[bot]

packages/google-cloud-bigquery-datatransfer/package.json

@@ -55,7 +55,7 @@
     "codecov": "^3.0.0",
     "eslint": "^4.13.1",
     "eslint-config-prettier": "^2.9.0",
-    "eslint-plugin-node": "^5.2.1",
+    "eslint-plugin-node": "^6.0.0",
     "eslint-plugin-prettier": "^2.3.1",
     "extend": "^3.0.1",
     "ink-docstrap": "^1.3.2",