chore: Upgrade Babel, Jest, Eslint (#1437)

* chore: Upgrade Prettier 1.8 -> 2.0

* chore: Upgrade Babel 6 -> 7

* chore: Upgrade eslint plugins

* chore: Add eslint import/order rules

* chore: Update flow-typed deps

server/api/notificationSettings.js

@@ -3,8 +3,8 @@ import Router from "koa-router";
 
 import auth from "../middlewares/authentication";
 import { NotificationSetting } from "../models";
-import { presentNotificationSetting } from "../presenters";
 import policy from "../policies";
+import { presentNotificationSetting } from "../presenters";
 
 const { authorize } = policy;
 const router = new Router();