ci: Add and configure isort, and make it happy

tests/test_feed.py

@@ -3,11 +3,10 @@
 from base64 import b64decode
 from collections import OrderedDict
 
-import pytest
 from nacl.signing import SigningKey, VerifyKey
+import pytest
 
-from ssb.feed import LocalMessage, LocalFeed, Feed, Message, NoPrivateKeyException
-
+from ssb.feed import Feed, LocalFeed, LocalMessage, Message, NoPrivateKeyException
 
 SERIALIZED_M1 = b"""{
   "previous": null,

tests/test_packet_stream.py

@@ -1,11 +1,11 @@
 """Tests for the packet stream"""
 
+from asyncio import Event, ensure_future, gather
 import json
-from asyncio import ensure_future, gather, Event
 
 import pytest
-
 from secret_handshake.network import SHSDuplexStream
+
 from ssb.packet_stream import PacketStream, PSMessageType
 
 

tests/test_util.py

@@ -5,8 +5,7 @@ from unittest.mock import mock_open, patch
 
 import pytest
 
-from ssb.util import load_ssb_secret, ConfigException
-
+from ssb.util import ConfigException, load_ssb_secret
 
 CONFIG_FILE = """
 ## Comments should be supported too