Run CI against Django main branch (#159)

* Run CI against Django `main` branch

I thought, it make sense to be ready and see possible issues upfront.
This practice is ofthen used by OSS Django packages, for example, check out: https://github.com/jazzband/

* Add changelog

* Drop 3.5 from tox matrix, as it was dropped in #119

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Add the functionality to import Django models using the `app_name.ModelName` convention in `import_from_str` [PR #140](https://github.com/model-bakers/model_bakery/pull/140)
 - Add the functionality to import recipes using `app_name.recipe_name` [PR #140](https://github.com/model-bakers/model_bakery/pull/140)
 - [dev] Add a unit test for `utils.seq` [PR #143](https://github.com/model-bakers/model_bakery/pull/143)
+- [dev] Run CI against `main` Django branch to cover possible upcoming changes/deprecations [PR #159](https://github.com/model-bakers/model_bakery/pull/159)
 
 ### Changed
 

setup.py

@@ -24,12 +24,15 @@
     classifiers=[
         "Development Status :: 5 - Production/Stable",
         "Framework :: Django",
+        "Framework :: Django :: 2.2",
+        "Framework :: Django :: 3.0",
+        "Framework :: Django :: 3.1",
         "Intended Audience :: Developers",
         "License :: OSI Approved :: Apache Software License",
         "Operating System :: OS Independent",
         "Topic :: Software Development",
         "Programming Language :: Python",
-        "Programming Language :: Python :: 3 :: Only",
+        "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",

tox.ini

@@ -1,8 +1,8 @@
 [tox]
 envlist =
-    py35-django{22}-{postgresql,sqlite}
     py{36,37,38}-django{22,30,31}-{postgresql,sqlite}
     py{39}-django{31}-{postgresql,sqlite}
+    py39-djangomain
     flake8
     isort
     pydocstyle
@@ -29,7 +29,12 @@ deps =
     django22: Django==2.2
     django30: Django>=3.0,<3.1
     django31: Django>=3.1,<3.2
+    djangomain: https://github.com/django/django/archive/main.tar.gz
     postgresql: psycopg2-binary
+ignore_outcome =
+    djangomain: True
+ignore_errors =
+    djangomain: True
 commands =
     pytest