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/management/commands/qmemory.py

@@ -27,5 +27,5 @@ class Command(BaseCommand):
     def handle(self, *args, **options):
         memory(
             run_once=options.get("run_once", False),
-            workers=options.get("workers", False)
+            workers=options.get("workers", False),
         )