fix(package): update @types/node to version 11.10.4

Closes #25

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
   "homepage": "https://github.com/HKUST-VISLab/koa-bodyparser-ts#readme",
   "dependencies": {
     "@types/koa": "^2.0.45",
-    "@types/node": "^10.0.3",
+    "@types/node": "^11.10.4",
     "co-body": "^6.0.0",
     "formidable": "^1.2.1"
   },