add mailboxDomain field to apps table

migrations/20190303024631-apps-default-mailboxName.js

@@ -1,12 +1,6 @@
 'use strict';
 
-var async = require('async'),
-    crypto = require('crypto'),
-    fs = require('fs'),
-    os = require('os'),
-    path = require('path'),
-    safe = require('safetydance'),
-    tldjs = require('tldjs');
+var async = require('async');
 
 exports.up = function(db, callback) {
     db.all('SELECT * FROM apps, subdomains WHERE apps.id=subdomains.appId AND type="primary"', function (error, apps) {