  DJANGO =
      2.2: django22
      3.0: django30
      3.1: django31
      master: djangomaster
  
  [testenv]
  commands = python -W error::DeprecationWarning -W error::PendingDeprecationWarning runtests.py --fast --coverage {posargs}
 
</s> remove        {py36,py37,py38,py39}-djangomaster,
 </s> add        {py36,py37,py38,py39}-django32,
       {py38,py39}-djangomaster,
    3.2: django32
  DJANGO =
      2.2: django22
      3.0: django30
      3.1: django31
    3.2: django32
      master: djangomaster
  
  [testenv]
  commands = python -W error::DeprecationWarning -W error::PendingDeprecationWarning runtests.py --fast --coverage {posargs}
keep keep keep add keep keep keep keep
 Dj32 (#7713)

adds django 3.2 line to the build matrix 
tox.ini