feat(mquery): remove "Query.Promise"

Author: hasezoey

lib/mquery.js

@@ -2899,7 +2899,6 @@ Query.utils = utils;
 Query.env = require('./env');
 Query.Collection = require('./collection');
 Query.BaseCollection = require('./collection/collection');
-Query.Promise = Promise;
 module.exports = exports = Query;
 
 // TODO