chore(package): update @types/node to version 13.13.3

Closes #55

Author: greenkeeper[bot]

package.json

@@ -54,7 +54,7 @@
   "devDependencies": {
     "@types/express": "^4.17.2",
     "@types/jest": "^24.0.22",
-    "@types/node": "^12.12.6",
+    "@types/node": "^13.13.3",
     "@types/socket.io": "^2.1.4",
     "ajv": "^6.10.2",
     "clean-webpack-plugin": "^3.0.0",