Update to isort > 5

A fair few backwards incompatible changes to how isort is used.

Author: pgjones

examples/trio-server.py

@@ -79,9 +79,10 @@
 from itertools import count
 from wsgiref.handlers import format_date_time
 
-import h11
 import trio
 
+import h11
+
 MAX_RECV = 2 ** 16
 TIMEOUT = 10
 

fuzz/afl-server.py

@@ -6,6 +6,7 @@
 import sys
 
 import afl
+
 import h11
 
 if sys.version_info[0] >= 3:

h11/tests/test_io.py

@@ -1,7 +1,7 @@
 import pytest
 
 from .._events import *
-from .._headers import normalize_and_validate, Headers
+from .._headers import Headers, normalize_and_validate
 from .._readers import (
     _obsolete_line_fold,
     ChunkedReader,

tox.ini

@@ -12,4 +12,4 @@ deps =
     isort
 commands =
     black --check --diff h11/ bench/ examples/ fuzz/
-    isort --dont-skip __init__.py --diff --check --settings-path setup.cfg --recursive h11 bench examples fuzz
+    isort --check --diff h11 bench examples fuzz