chore(deps): update dependency eslint-plugin-node to v8 (#105)

Author: renovate[bot]

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

@@ -55,7 +55,7 @@
     "codecov": "^3.0.2",
     "eslint": "^5.0.0",
     "eslint-config-prettier": "^3.0.0",
-    "eslint-plugin-node": "^7.0.0",
+    "eslint-plugin-node": "^8.0.0",
     "eslint-plugin-prettier": "^3.0.0",
     "extend": "^3.0.1",
     "ink-docstrap": "^1.3.2",