add updated_at field to links_to_validate table

src/db/mongo_manager.py

@@ -233,8 +233,10 @@ class MongoDbManager:
 
     def save_links_to_validate(self, link: str):
         collection_to_use = self.db[LINKS_TO_VALIDATE]
+        updated_at = time.strftime("%H:%M:%S", time.localtime())
         collection_to_use.replace_one(filter={'_id': link, }, replacement={
-            u'url': link
+            u'url': link,
+            "updated_at": updated_at
         },
                                       upsert=True)