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

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

simpervisor/atexitasync.py

@@ -3,6 +3,7 @@
 
 Handles SIGINT and SIGTERM, unlike atexit
 """
+
 import signal
 import sys
 

simpervisor/process.py

@@ -1,6 +1,7 @@
 """
 Simple asynchronous process supervisor
 """
+
 import asyncio
 import logging
 import signal

tests/child_scripts/signalprinter.py

@@ -1,6 +1,7 @@
 """
 Print received SIGTERM & SIGINT signals
 """
+
 import asyncio
 import sys
 from functools import partial

tests/child_scripts/signalsupervisor.py

@@ -1,6 +1,7 @@
 """
 Start a child process that prints signals it receives
 """
+
 import asyncio
 import os
 import sys

tests/child_scripts/simplehttpserver.py

@@ -1,6 +1,7 @@
 """
 Simple echo http server
 """
+
 import os
 import sys
 import time