Make CircleCI run tests against Django 3.1

Author: Photonios

.circleci/config.yml

@@ -20,7 +20,7 @@ jobs:
 
             - run:
                 name: Run tests
-                command: tox -e 'py36-dj{20,21,22,30}'
+                command: tox -e 'py36-dj{20,21,22,30,31}'
                 environment:
                     DATABASE_URL: 'postgres://psqlextra:psqlextra@localhost:5432/psqlextra'
 
@@ -44,7 +44,7 @@ jobs:
 
             - run:
                 name: Run tests
-                command: tox -e 'py37-dj{20,21,22,30}'
+                command: tox -e 'py37-dj{20,21,22,30,31}'
                 environment:
                     DATABASE_URL: 'postgres://psqlextra:psqlextra@localhost:5432/psqlextra'
 
@@ -68,7 +68,7 @@ jobs:
 
             - run:
                 name: Run tests
-                command: tox -e 'py38-dj{20,21,22,30}'
+                command: tox -e 'py38-dj{20,21,22,30,31}'
                 environment:
                     DATABASE_URL: 'postgres://psqlextra:psqlextra@localhost:5432/psqlextra'
 
@@ -99,7 +99,7 @@ jobs:
 
             - run:
                 name: Run tests
-                command: tox -e 'py39-dj{21,22,30}'
+                command: tox -e 'py39-dj{21,22,30,31}'
                 environment:
                     DATABASE_URL: 'postgres://psqlextra:psqlextra@localhost:5432/psqlextra'
 
@@ -112,7 +112,7 @@ jobs:
 
     analysis:
         docker:
-            - image: python:3.7-alpine
+            - image: python:3.8-alpine
         steps:
             - checkout
             - run: