Patches for Django warnings (#702)

* Remove deprecated providing_args argument

RemovedInDjango40Warning: The providing_args argument is deprecated.
As it is purely documentational, it has no replacement. If you rely
on this argument as documentation, you can move the text to a code
comment or docstring.

* Try using django.urls.re_path() instead of django.conf.urls.url()

but keep compatibility with older Django versions.

RemovedInDjango40Warning: django.conf.urls.url() is deprecated in
favor of django.urls.re_path().

* Add myself to AUTHORS.rst

Author: atodorov

AUTHORS.rst

@@ -103,6 +103,7 @@ Authors
 - `vnagendra <https://github.com/vnagendra>`_
 - `yakimka <https://github.com/yakimka>`_
 - `Paulo Peres <https://github.com/PauloPeres>`_
+- `Alex Todorov <https://github.com/atodorov>`_
 
 Background
 ==========

simple_history/admin.py

@@ -4,7 +4,11 @@
 from django import http
 from django.apps import apps as django_apps
 from django.conf import settings
-from django.conf.urls import url
+
+try:
+    from django.urls import re_path as url
+except ImportError:
+    from django.conf.urls import url
 from django.contrib import admin
 from django.contrib.admin import helpers
 from django.contrib.admin.utils import unquote

simple_history/signals.py

@@ -1,23 +1,10 @@
 import django.dispatch
 
 
-pre_create_historical_record = django.dispatch.Signal(
-    providing_args=[
-        "instance",
-        "history_instance",
-        "history_date",
-        "history_user",
-        "history_change_reason",
-        "using",
-    ]
-)
-post_create_historical_record = django.dispatch.Signal(
-    providing_args=[
-        "instance",
-        "history_instance",
-        "history_date",
-        "history_user",
-        "history_change_reason",
-        "using",
-    ]
-)
+# Arguments: "instance",  "history_instance", "history_date",
+#            "history_user", "history_change_reason", "using"
+pre_create_historical_record = django.dispatch.Signal()
+
+# Arguments: "instance",  "history_instance", "history_date",
+#            "history_user", "history_change_reason", "using"
+post_create_historical_record = django.dispatch.Signal()

simple_history/tests/urls.py

@@ -1,6 +1,9 @@
 from __future__ import unicode_literals
 
-from django.conf.urls import url
+try:
+    from django.urls import re_path as url
+except ImportError:
+    from django.conf.urls import url
 from django.contrib import admin
 
 from simple_history.tests.view import (