wait between scrapping requests, avoid triggering captcha interception

src/aliexpress.py

@@ -1,5 +1,5 @@
 #!/usr/bin/python
-import requests, re, json, os, yaml
+import requests, re, json, os, yaml, time
 from db import *
 
 def load_cookies_from_file(file_path):
@@ -98,6 +98,7 @@ def update_items():
     '''add new history entries for items in database'''
     in_db = get_item_keys()
     for item in in_db:
+        time.sleep(2)
         new_entry = check_item(item)
         fill_db(new_entry)