chore(package): update @types/node to version 12.0.2

Closes #6

Author: greenkeeper[bot]

package.json

@@ -33,6 +33,6 @@
     "request-promise-native": "^1.0.7"
   },
   "devDependencies": {
-    "@types/node": "^11.9.5"
+    "@types/node": "^12.0.2"
   }
 }