moved import to make pylint happy, take 2

torba/testcase.py

@@ -1,8 +1,8 @@
 import sys
 import logging
 import unittest
-from typing import Optional
 from unittest.case import _Outcome
+from typing import Optional
 from torba.orchstr8 import Conductor
 from torba.orchstr8.node import BlockchainNode, WalletNode
 from torba.client.baseledger import BaseLedger