          'License :: OSI Approved :: BSD License',
          'Operating System :: OS Independent',
          'Programming Language :: Python',
          'Programming Language :: Python :: 3',
          'Programming Language :: Python :: 3.5',
          'Programming Language :: Python :: 3.6',
          'Programming Language :: Python :: 3.7',
          'Programming Language :: Python :: 3.8',
          'Programming Language :: Python :: 3.9',
          'Programming Language :: Python :: 3 :: Only',
 
</s> remove        {py36,py37,py38,py39}-django32,
       {py38,py39}-{django40,djangomain},
 </s> add        {py36,py37,py38,py39,py310}-django32,
       {py38,py39,py310}-{django40,djangomain},
          'License :: OSI Approved :: BSD License',
          'Operating System :: OS Independent',
          'Programming Language :: Python',
          'Programming Language :: Python :: 3',

          'Programming Language :: Python :: 3.6',
          'Programming Language :: Python :: 3.7',
          'Programming Language :: Python :: 3.8',
          'Programming Language :: Python :: 3.9',
          'Programming Language :: Python :: 3 :: Only',
keep keep keep keep replace keep keep keep keep keep
 Add 3.10 to tox.ini and setup.py 
setup.py