Added testing against Django 5.1. (#1670)

Author: carltongibson

pyproject.toml

@@ -18,6 +18,7 @@ classifiers = [
     "Framework :: Django",
     "Framework :: Django :: 4.2",
     "Framework :: Django :: 5.0",
+    "Framework :: Django :: 5.1",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3.8",

tox.ini

@@ -2,6 +2,7 @@
 envlist =
        {py38, py39, py310, py311, py312}-django42,
        {py310, py311, py312}-django50,
+       {py310, py311, py312}-django51,
        {py310, py311, py312}-latest,
        isort,lint,docs,warnings,
 isolated_build = true
@@ -19,6 +20,7 @@ setenv =
 deps =
     django42: Django>=4.2rc1,<5.0
     django50: Django>=5.0b1,<5.1
+    django51: Django>=5.1a1,<5.2
     !latest: djangorestframework
     latest: {[latest]deps}
     -r requirements/test-ci.txt