chore(package): update @types/node to version 11.9.3

Closes #127

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "@types/chai": "^4.1.4",
     "@types/chance": "^1.0.1",
     "@types/mocha": "^5.2.5",
-    "@types/node": "^10.12.12",
+    "@types/node": "^11.9.3",
     "@types/request": "^2.47.1",
     "@types/request-promise-native": "^1.0.15",
     "aws-sdk": "^2.389.0",