root/pypi: links for pypexels

root/pypi pypexels-1.0.0rc1.tar.gz
root/pypi pypexels-1.0.0b4.tar.gz
root/pypi pypexels-1.0.0b3.tar.gz
root/pypi pypexels-1.0.0b2.tar.gz
root/pypi pypexels-1.0.0b1.tar.gz