Feature: Add UI to update email notification preferences (#579)

app/javascript/dashboard/api/userNotificationSettings.js

@@ -0,0 +1,14 @@
+/* global axios */
+import ApiClient from './ApiClient';
+
+class UserNotificationSettings extends ApiClient {
+  constructor() {
+    super('user/notification_settings');
+  }
+
+  update(params) {
+    return axios.patch(`${this.url}`, params);
+  }
+}
+
+export default new UserNotificationSettings();