Add more combinations to testing matrix.

tox.ini

@@ -5,12 +5,15 @@ isolated_build_env = .package
 
 # https://docs.djangoproject.com/en/dev/faq/install/#what-python-version-can-i-use-with-django
 envlist =
-    py{37,38,39}-django{22,30}-drf{310,311,312},
-    py{37,38,39}-django{31,32}-drf{311,312},
-    py{39,310}-django{40,41}-drf{313,314,315}
-    py311-django{40,41,42}-drf{314,315}
-    py38-{lint, docs},
-    py310-djmaster
+    py{37,38,39}-django{22,30}-drf{310,311,312}
+    py{37,38,39}-django31-drf{311,312}
+    py{37,38,39,310}-django32-drf{311,312}
+    py{38,39,310}-django40-drf{313,314,315}
+    py{38,39,310,311}-django41-drf{313,314,315}
+    py{38,39,310,311}-django42-drf{314,315}
+    py{310,311}-django50-drf{314,315}
+    py38-{lint,docs}
+    py311-djmaster
 
 skip_missing_interpreters = true
 
@@ -30,6 +33,7 @@ deps =
     django40: Django>=4.0,<4.1
     django41: Django>=4.1,<4.2
     django42: Django>=4.2,<5.0
+    django50: Django>=5.0,<5.1
 
     drf310: djangorestframework>=3.10,<3.11
     drf311: djangorestframework>=3.11,<3.12