Update request-promise to the latest version 🚀 (#990)

* chore(package): update request-promise to version 4.2.4

* chore(package): update lockfile package-lock.json

Author: greenkeeper[bot]

package-lock.json

@@ -85,7 +85,7 @@
     "react-router-dom": "4.3.1",
     "react-test-renderer": "16.8.2",
     "request": "2.87.0",
-    "request-promise": "4.2.3",
+    "request-promise": "4.2.4",
     "sass-loader": "7.1.0",
     "style-loader": "0.23.0",
     "svg-prep": "1.0.4",