Django 4.0 support (#4)

* support Django 4.0
* --noinput on test runs
* fix Django versions in tox
* add --keepdb to tox runner
* pin psycopg2-binary

Pipfile

@@ -7,7 +7,7 @@ name = "pypi"
 
 [dev-packages]
 black = "==19.10b0"
-Django = ">=3.1,<3.2"
+Django = ">=4.0,<4.1"
 flake8 = "*"
-psycopg2-binary = "*"
+psycopg2-binary = "==2.8.*"
 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, 3.0, or 3.1
+- Django 2.2, 3.0, 3.1, 3.2, or 4.0
 
 ## 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, 3.0, and 3.1, dropped support for <2.2
+- added support for Django 2.2, 3.0, 3.1, 3.2, and 4.0, dropped support for <2.2

tox.ini

@@ -2,7 +2,7 @@
 envlist =
     format
     lint
-    django{22,30,31}-postgresql
+    django{22,30,31,32,40}-postgresql
 
 [flake8]
 exclude =
@@ -21,13 +21,15 @@ setenv =
     HOME={env:HOME}
     USER={env:USER}
     DJANGO_SETTINGS_MODULE=test_project.settings
-commands = {envpython} manage.py test tests
+commands = {envpython} manage.py test --keepdb --noinput 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
+    django32: Django>=3.2,<3.2.99
+    django40: Django>=4.0,<4.0.99
+    postgresql: psycopg2-binary==2.8.*
 
 [testenv:lint]
 deps = flake8