         {py35,py36,py37}-django22,
         {py36,py37,py38}-django30,
         {py36,py37,py38,py39}-django31,
         {py36,py37,py38,py39}-django32,
         {py38,py39}-djangomaster,
         base,dist,lint,docs,
  
  [travis:env]
  DJANGO =
      2.2: django22
 
</s> remove     master: djangomaster
 </s> add     main: djangomain </s> remove         djangomaster: https://github.com/django/django/archive/master.tar.gz
 </s> add         djangomain: https://github.com/django/django/archive/main.tar.gz </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 }
       {py38,py39}-djangomain,
         {py35,py36,py37}-django22,
         {py36,py37,py38}-django30,
         {py36,py37,py38,py39}-django31,
         {py36,py37,py38,py39}-django32,
       {py38,py39}-djangomain,
         base,dist,lint,docs,
  
  [travis:env]
  DJANGO =
      2.2: django22
keep keep keep keep replace keep keep keep keep keep
 Updated tox/travis to point to Django `main` branch. (#7827) 
tox.ini