fix lint issue

Author: jsonbailey

ldclient/config.py

@@ -4,10 +4,10 @@
 Note that the same class can also be imported from the ``ldclient.client`` submodule.
 """
 
+import warnings
 from dataclasses import dataclass
 from threading import Event
 from typing import Callable, List, Optional, Protocol, Set, TypeVar
-import warnings
 
 from ldclient.feature_store import InMemoryFeatureStore
 from ldclient.hook import Hook