Drop support for Django 2.0 (#5684)

.travis.yml

@@ -7,12 +7,8 @@ addons:
 
 matrix:
   include:
-   - env: TOXENV=py35-dj20-sqlite-noelasticsearch
-     python: 3.5
    - env: TOXENV=py35-dj21-mysql-noelasticsearch
      python: 3.5
-   - env: TOXENV=py36-dj20-postgres-noelasticsearch
-     python: 3.6
    - env: TOXENV=py36-dj21-postgres-noelasticsearch
      python: 3.6
    - env: TOXENV=py37-dj21-postgres-noelasticsearch
@@ -29,14 +25,10 @@ matrix:
      python: 3.7
    - env: TOXENV=py38-dj22-postgres-noelasticsearch
      python: 3.8
-   - env: TOXENV=py36-dj20-sqlite-elasticsearch2 INSTALL_ELASTICSEARCH2=yes
-     python: 3.6
    - env: TOXENV=py36-dj21-sqlite-elasticsearch2 INSTALL_ELASTICSEARCH2=yes
      python: 3.6
    - env: TOXENV=py36-dj21-postgres-elasticsearch5 INSTALL_ELASTICSEARCH5=yes
      python: 3.6
-   - env: TOXENV=py36-dj20-postgres-elasticsearch6 INSTALL_ELASTICSEARCH6=yes
-     python: 3.6
    - env: TOXENV=py36-dj21-postgres-elasticsearch6 INSTALL_ELASTICSEARCH6=yes
      python: 3.6
    - env: TOXENV=py37-dj22-postgres-elasticsearch6 INSTALL_ELASTICSEARCH6=yes
@@ -47,10 +39,8 @@ matrix:
      python: 3.8
   allow_failures:
     # Ignore failures on Elasticsearch tests because ES on Travis is intermittently flaky
-    - env: TOXENV=py36-dj20-sqlite-elasticsearch2 INSTALL_ELASTICSEARCH2=yes
     - env: TOXENV=py36-dj21-sqlite-elasticsearch2 INSTALL_ELASTICSEARCH2=yes
     - env: TOXENV=py36-dj21-postgres-elasticsearch5 INSTALL_ELASTICSEARCH5=yes
-    - env: TOXENV=py36-dj20-postgres-elasticsearch6 INSTALL_ELASTICSEARCH6=yes
     - env: TOXENV=py36-dj21-postgres-elasticsearch6 INSTALL_ELASTICSEARCH6=yes
     - env: TOXENV=py37-dj22-postgres-elasticsearch6 INSTALL_ELASTICSEARCH6=yes
     - env: TOXENV=py37-dj22-postgres-elasticsearch7 INSTALL_ELASTICSEARCH7=yes

docs/contributing/developing.rst

@@ -77,7 +77,7 @@ an argument to ``runtests.py`` or ``tox``:
     $ python runtests.py wagtail.core
 
     $ # Running in a specified Tox environment
-    $ tox -e py36-dj20-sqlite-noelasticsearch wagtail.core
+    $ tox -e py36-dj22-sqlite-noelasticsearch wagtail.core
 
     $ # See a list of available Tox environments
     $ tox -l
@@ -91,7 +91,7 @@ an argument to ``runtests.py``
     $ python runtests.py wagtail.core.tests.test_blocks.TestIntegerBlock
 
     $ # Running in a specified Tox environment
-    $ tox -e py36-dj20-sqlite-noelasticsearch wagtail.core.tests.test_blocks.TestIntegerBlock
+    $ tox -e py36-dj22-sqlite-noelasticsearch wagtail.core.tests.test_blocks.TestIntegerBlock
 
 Running migrations for the test app models
 ------------------------------------------

docs/releases/upgrading.rst

@@ -131,5 +131,5 @@ The compatible versions of Django and Python for each Wagtail release are:
 +-------------------+------------------------------+-----------------------------+
 | 2.7 LTS           | 2.0, 2.1, 2.2                | 3.5, 3.6, 3.7, 3.8          |
 +-------------------+------------------------------+-----------------------------+
-| 2.8               | 2.0, 2.1, 2.2                | 3.5, 3.6, 3.7, 3.8          |
+| 2.8               | 2.1, 2.2                     | 3.5, 3.6, 3.7, 3.8          |
 +-------------------+------------------------------+-----------------------------+

setup.py

@@ -98,7 +98,6 @@ https://github.com/wagtail/wagtail/.",
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Framework :: Django',
-        'Framework :: Django :: 2.0',
         'Framework :: Django :: 2.1',
         'Framework :: Django :: 2.2',
         'Framework :: Wagtail',

tox.ini

@@ -2,7 +2,7 @@
 skipsdist = True
 usedevelop = True
 
-envlist = py{35,36,37}-dj{20,21,22,master}-{sqlite,postgres,mysql,mssql}-{elasticsearch7,elasticsearch6,elasticsearch5,elasticsearch2,noelasticsearch},
+envlist = py{35,36,37}-dj{21,22,master}-{sqlite,postgres,mysql,mssql}-{elasticsearch7,elasticsearch6,elasticsearch5,elasticsearch2,noelasticsearch},
 
 [testenv]
 install_command = pip install -e ".[testing]" -U {opts} {packages}
@@ -23,7 +23,6 @@ deps =
     django-sendfile==0.3.6
     Embedly
 
-    dj20: Django>=2.0,<2.1
     dj21: Django>=2.1,<2.2
     dj22: Django>=2.2,<2.3
     dj22stable: git+https://github.com/django/django.git@stable/2.2.x#egg=Django