utils/scanpypi: don't pass any arguments to main()

utils/scanpypi: don't pass any arguments to main()

'if __name__ == "__main__"' idiom typically calls main function that
doesn't take any arguments in most cases. We shouldn't pass any tuple to
it.
I've tested the script with python-idna-2.5 and now it works with this
little change.

Signed-off-by: Alexey Roslyakov <alexey.roslyakov@gmail.com>
Reviewed-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>