chore(deps): update dependency eslint-plugin-node to v8 (#219)

Author: renovate[bot]

packages/google-cloud-speech/package.json

@@ -89,7 +89,7 @@
     "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",
     "ink-docstrap": "^1.3.2",
     "intelli-espower-loader": "^1.0.1",