remove unused os.path
diff --git a/pre_commit_hooks/check_case_conflict.py b/pre_commit_hooks/check_case_conflict.py
index d7ab860..712b993 100644
--- a/pre_commit_hooks/check_case_conflict.py
+++ b/pre_commit_hooks/check_case_conflict.py
@@ -1,5 +1,4 @@
 import argparse
-import os.path
 from typing import Iterable
 from typing import Iterator
 from typing import Optional