chore(package): update @types/node to version 11.13.9

Closes #81

Author: greenkeeper[bot]

package.json

@@ -39,7 +39,7 @@
     "yaml": "^1.0.0"
   },
   "devDependencies": {
-    "@types/node": "^10.10.3"
+    "@types/node": "^11.13.9"
   },
   "pkg": {
     "scripts": [