Update eslint-plugin-node to the latest version 🚀 (#32)

Author: greenkeeper[bot]

packages/google-cloud-language/package.json

@@ -68,7 +68,7 @@
     "codecov": "^3.0.0",
     "eslint": "^4.8.0",
     "eslint-config-prettier": "^2.6.0",
-    "eslint-plugin-node": "^5.2.0",
+    "eslint-plugin-node": "^6.0.0",
     "eslint-plugin-prettier": "^2.3.1",
     "extend": "^3.0.1",
     "ink-docstrap": "^1.3.0",