[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

model_clone/admin.py

@@ -11,6 +11,7 @@
 
 class CloneModelAdminMixin(object):
     """Mixin to handle duplication of models."""
+
     include_duplicate_action = True
     include_duplicate_object_link = True
 

model_clone/utils.py

@@ -1,7 +1,5 @@
 import contextlib
-import functools
 import re
-import warnings
 
 import six
 from django.db import models, transaction

sample_assignment/admin.py

@@ -1,4 +1,5 @@
 from django.contrib import admin
+
 from sample_assignment.models import Contract