Build improvements (#569)

* Black linting

* Adding Black to dev dependencies and upping minimal python to 3.6.2 for compatibility

* Updating packages

* Removing pip-tools input and exporting requirements with poetry

* Deleting old setup files and test runner

* Trying 1.3.7

* Looser extras requirements to prevent conflicts

* Sorted imports with isort

* Added iSort to dev dependencies

* Fixes localtime for naive setups

django_q/tests/test_brokers.py

@@ -4,7 +4,7 @@ from time import sleep
 import pytest
 import redis
 
-from django_q.brokers import get_broker, Broker
+from django_q.brokers import Broker, get_broker
 from django_q.conf import Conf
 from django_q.humanhash import uuid
 
@@ -194,7 +194,7 @@ def canceled_sqs(monkeypatch):
             "aws_region": os.getenv("AWS_REGION"),
             "aws_access_key_id": os.getenv("AWS_ACCESS_KEY_ID"),
             "aws_secret_access_key": os.getenv("AWS_SECRET_ACCESS_KEY"),
-            "receive_message_wait_time_seconds": 20
+            "receive_message_wait_time_seconds": 20,
         },
     )
     # check broker