Update transaction.py

eth_portfolio/_loaders/transaction.py

@@ -6,6 +6,7 @@
 The primary focus of this module is to support eth-portfolio's internal operations such as loading transactions by address and nonce, retrieving transaction details from specific blocks, and managing transaction-related data.
 """
 
+import asyncio
 import logging
 from collections import defaultdict
 from typing import DefaultDict, Dict, List, Optional, Tuple