chore: clean up tox, remove travis, add recommended files

.editorconfig

@@ -0,0 +1,17 @@
+# Check http://editorconfig.org for more information
+# This is the main config file for this project:
+root = true
+
+[*]
+charset = utf-8
+trim_trailing_whitespace = true
+end_of_line = lf
+indent_style = space
+insert_final_newline = true
+indent_size = 2
+
+[*.py]
+indent_size = 4
+
+[*.pyi]
+indent_size = 4

.travis.yml

@@ -1,30 +0,0 @@
-language: python
-matrix:
-    include:
-        - python: 3.6
-          env: TOXENV=py36-django31
-        - python: 3.6
-          env: TOXENV=py36-django32
-        - python: 3.7
-          env: TOXENV=py37-django31
-        - python: 3.7
-          env: TOXENV=py37-django32
-        - python: 3.8
-          env: TOXENV=py38-django31
-        - python: 3.8
-          env: TOXENV=py38-django32
-        - python: 3.9
-          env: TOXENV=py39-django31
-        - python: 3.9
-          env: TOXENV=py39-django32
-install:
-    - pip install Django>=3.1
-    - pip install coveralls==1.3.0
-    - pip install coverage==4.5.1
-    - pip install tox-travis==0.10
-before_script:
-    - coverage erase
-script:
-    - coverage run --source=eav runtests; tox
-after_success:
-    - COVERALLS_REPO_TOKEN=71NkMDQFpFKB9QYXoK12LYuWUEmQ2wD6V coveralls

tox.ini

@@ -1,32 +1,17 @@
 [tox]
+isolated_build = true
 envlist =
-    py36-django{31,32,tip},
-    py37-django{31,32,tip},
-    py38-django{31,32,tip}
-    py39-django{31,32,tip}
-    migrationscheck
+    py{35,36,37,38,39}-django22
+    py{36,37,38,39}-django{30,31,32,tip}
 
 [testenv]
-pip_pre=True
-
+locked_deps =
+    pytest
+    pytest-cov
 deps =
+    django22: django>=2.2,<2.3
     django31: Django >= 3.1, <3.2
     django32: Django >= 3.2
     djangotip: https://github.com/django/django/archive/refs/heads/main.tar.gz
-
-commands =
-    ./runtests
-
-[testenv:migrationscheck]
-pip_pre=True
-
-deps =
-    Django
-
-setenv =
-    DJANGO_SETTINGS_MODULE=tests.test_settings
-
-# make test fail if missing migrations
-commands =
-    django-admin makemigrations --check --dry-run
-
+commands = pytest --cov {envsitepackagesdir}/eav --import-mode=importlib
+whitelist_externals = pytest