test against Django 3.1 (#3)

Author: jcarbaugh

Pipfile

@@ -7,7 +7,7 @@ name = "pypi"
 
 [dev-packages]
 black = "==19.10b0"
-Django = ">=3.0,<3.1"
+Django = ">=3.1,<3.2"
 flake8 = "*"
 psycopg2-binary = "*"
 tox = "*"

README.md

@@ -11,7 +11,7 @@ Based on [django-add-default-value](https://github.com/3YOURMIND/django-add-defa
 ## Dependencies
 
 - Python 3.6, 3.7, 3.8, or 3.9
-- Django 2.2 or 3.0
+- Django 2.2, 3.0, or 3.1
 
 ## Installation
 
@@ -76,4 +76,4 @@ django-add-default-value-postgresql is released under the Apache 2.0 License, ba
 - removed MSSQL-related code
 - added allow_migrate_model check on database_forwards and database_backwards
 - added support for Python 3.7, 3.8, and 3.9, dropped support for <3.6
-- added support for Django 2.2 and 3.0, dropped support for <2.2
+- added support for Django 2.2, 3.0, and 3.1, dropped support for <2.2

setup.cfg

@@ -11,6 +11,7 @@ classifiers =
 	Framework :: Django
 	Framework :: Django :: 2.2
 	Framework :: Django :: 3.0
+	Framework :: Django :: 3.1
 	License :: OSI Approved :: Apache Software License
 	Programming Language :: Python
 	Programming Language :: Python :: 3

tox.ini

@@ -2,7 +2,7 @@
 envlist =
     format
     lint
-    django{22,30}-postgresql
+    django{22,30,31}-postgresql
 
 [flake8]
 exclude =
@@ -26,14 +26,14 @@ commands = {envpython} manage.py test tests
 deps =
     django22: Django>=2.2,<2.2.99
     django30: Django>=3.0,<3.0.99
+    django31: Django>=3.1,<3.1.99
     postgresql: psycopg2-binary
 
 [testenv:lint]
 deps = flake8
 changedir = {toxinidir}
 commands = flake8 django_add_default_value
 
-
 [testenv:format]
 deps = black
 changedir = {toxinidir}