Allow symbol as parameter for getTradeRecords

lib/rest-client.js

@@ -179,7 +179,7 @@ module.exports = class RestClient {
 
   async getTradeRecords(params) {
     assert(params, 'No params passed');
-    assert(params.order_id, 'Parameter order_id is required');
+    assert(params.order_id || params.symbol, 'Parameter order_id OR symbol is required');
 
     return await this.request.get('/v2/private/execution/list', params);
   }