fix(deps): update dependency es6-promise to v4.2.5

Author: renovate-bot

package.json

@@ -15,7 +15,7 @@
   },
   "dependencies": {
     "@types/node": "^10.3.0",
-    "es6-promise": "4.2.4",
+    "es6-promise": "4.2.5",
     "form-data": "2.3.2",
     "isomorphic-fetch": "2.2.1",
     "tslib": "1.9.3",