          django22: Django>=2.2,<3.0
          django30: Django>=3.0,<3.1
          django31: Django>=3.1,<3.2
          django32: Django>=3.2a1,<4.0
          djangomaster: https://github.com/django/django/archive/master.tar.gz
          -rrequirements/requirements-testing.txt
          -rrequirements/requirements-optionals.txt
  
  [testenv:base]
  ; Ensure optional dependencies are not required
 
</s> remove     master: djangomaster
 </s> add     main: djangomain </s> remove        {py38,py39}-djangomaster,
 </s> add        {py38,py39}-djangomain, </s> remove       - env: DJANGO=master
 </s> add       - env: DJANGO=main </s> remove       - { python: "3.9", env: DJANGO=master }
 </s> add       - { python: "3.9", env: DJANGO=main } </s> remove       - { python: "3.8", env: DJANGO=master }
 </s> add       - { python: "3.8", env: DJANGO=main }
        djangomain: https://github.com/django/django/archive/main.tar.gz
          django22: Django>=2.2,<3.0
          django30: Django>=3.0,<3.1
          django31: Django>=3.1,<3.2
          django32: Django>=3.2a1,<4.0
        djangomain: https://github.com/django/django/archive/main.tar.gz
          -rrequirements/requirements-testing.txt
          -rrequirements/requirements-optionals.txt
  
  [testenv:base]
  ; Ensure optional dependencies are not required
keep keep keep keep replace keep keep keep keep keep
 Updated tox/travis to point to Django `main` branch. (#7827) 
tox.ini