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

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

Author: pre-commit-ci[bot]

nbclient/tests/test_util.py

@@ -6,7 +6,7 @@
 import pytest
 import tornado
 
-from nbclient.util import run_hook, run_sync, just_run
+from nbclient.util import just_run, run_hook, run_sync
 
 
 @run_sync

requirements-dev.txt

@@ -8,9 +8,9 @@ mypy
 pip>=18.1
 pre-commit
 psutil
+pytest>=4.1
 pytest-asyncio
 pytest-cov>=2.6.1
-pytest>=4.1
 setuptools>=60.0
 testpath
 twine>=1.11.0