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

Closes #4

Author: greenkeeper[bot]

package.json

@@ -28,7 +28,7 @@
   "devDependencies": {
     "@types/lodash": "^4.14.106",
     "@types/mocha": "^5.2.6",
-    "@types/node": "~11.9.4",
+    "@types/node": "~13.13.3",
     "@types/sinon": "^7.0.5",
     "mocha": "6.0.0",
     "node-mocks-http": "^1.7.3",