fix(package): update @types/node to version 13.9.4

Closes #12

Author: greenkeeper[bot]

package.json

@@ -49,7 +49,7 @@
     "@nestjs/websockets": "^4.5.8",
     "@types/dotenv": "^4.0.2",
     "@types/jsonwebtoken": "^7.2.5",
-    "@types/node": "^9.3.0",
+    "@types/node": "^13.9.4",
     "typedoc": "^0.10.0",
     "ts-node": "^4.1.0",
     "del-cli": "^1.1.0",