Bump @types/node from 8.5.2 to 9.4.0

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped) from 8.5.2 to 9.4.0.
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits)

Author: dependabot-support

package-lock.json

@@ -20,7 +20,7 @@
     "react-dom": "^16.2.0"
   },
   "devDependencies": {
-    "@types/node": "^8.5.2",
+    "@types/node": "^9.4.0",
     "@types/react": "^16.0.36",
     "@types/react-dom": "^16.0.3",
     "@types/tape": "^4.2.31",