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/urls.py

@@ -1,6 +1,6 @@
-from django.urls import re_path
 from django.contrib import admin
+from django.urls import re_path
 
 urlpatterns = [
-    re_path(r'^admin/', admin.site.urls),
+    re_path(r"^admin/", admin.site.urls),
 ]