Removed unneeded Promise.resolve

no issue

- was not removed during url service cleanup
- the function runs synchronously
- has no impact on functionality

core/server/services/url/UrlGenerator.js

@@ -1,7 +1,6 @@
 'use strict';
 
 const _ = require('lodash'),
-    Promise = require('bluebird'),
     moment = require('moment-timezone'),
     jsonpath = require('jsonpath'),
     debug = require('ghost-ignition').debug('services:url:generator'),
@@ -89,7 +88,7 @@ class UrlGenerator {
 
         // CASE: you are type "pages", but the incoming type is "users"
         if (event.type !== this.routingType.getType()) {
-            return Promise.resolve();
+            return;
         }
 
         const resource = this.resources.getByIdAndType(event.type, event.id);