Removed obsolete version check in setup.py.
Removed obsolete version check in setup.py.

This was originally added to ensure that Django 2.0+ could not be
installed on Python 2.7 or earlier, in particular where the version of
pip or setuptools being used did not support the python_requires
argument.

Unfortunately, as REQUIRED_PYTHON has been bumped, this check no longer
satisfies its original purpose and could be misleading, e.g. if
REQUIRED_PYTHON is 3.8 and CURRENT_PYTHON is 3.7 it would request that
Django < 2 is installed, but there are later versions of Django that
support Python 3.7.

By the time Django 4 is released in December 2021, the python_requires
argument will have been supported for over five years, and Python 2 will
have been EOL for nearly two years, so we can remove this check.

See https://packaging.python.org/guides/distributing-packages-using-setuptools/#python-requires
felixxm/django,rsalmaso/django,manhhomienbienthuy/django,solarissmoke/django,atul-bhouraskar/django,MarkusH/django,felixxm/django,pauloxnet/django,monetate/django,takis/django,ghickman/django,auvipy/django,blighj/django,dsanders11/django,manhhomienbienthuy/django,ghickman/django,shaib/django,rsalmaso/django,solarissmoke/django,monetate/django,manhhomienbienthuy/django,shaib/django,auvipy/django,blighj/django,pauloxnet/django,rsalmaso/django,freakboy3742/django,MarkusH/django,blighj/django,ghickman/django,takis/django,shaib/django,apollo13/django,solarissmoke/django,django/django,ghickman/django,apollo13/django,felixxm/django,dsanders11/django,auvipy/django,atul-bhouraskar/django,MarkusH/django,django/django,django/django,atul-bhouraskar/django,apollo13/django,monetate/django,manhhomienbienthuy/django,apollo13/django,django/django,takis/django,blighj/django,shaib/django,takis/django,solarissmoke/django,pauloxnet/django,atul-bhouraskar/django,auvipy/django,rsalmaso/django,freakboy3742/django,dsanders11/django,monetate/django,MarkusH/django,freakboy3742/django,felixxm/django,pauloxnet/django,dsanders11/django