Add trove classifiers for all supported Python versions
Add trove classifiers for all supported Python versions

daniell/django-import-export,jnns/django-import-export,copperleaftech/django-import-export,copperleaftech/django-import-export,daniell/django-import-export,jnns/django-import-export,bmihelac/django-import-export,django-import-export/django-import-export,copperleaftech/django-import-export,django-import-export/django-import-export,copperleaftech/django-import-export,daniell/django-import-export,jnns/django-import-export,bmihelac/django-import-export,daniell/django-import-export,jnns/django-import-export,django-import-export/django-import-export,bmihelac/django-import-export,bmihelac/django-import-export,django-import-export/django-import-export