chore(package): update @types/node to version 11.9.2

Closes #34

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "@types/aws-lambda": "^0.0.35",
     "@types/http-errors": "^1.6.1",
     "@types/jest": "^22.2.2",
-    "@types/node": "^10.0.3",
+    "@types/node": "^11.9.2",
     "@types/sinon": "^4.3.0",
     "jest": "^22.4.3",
     "sinon": "^4.5.0",