root/pypi: links for echopop

root/pypi echopop-0.4.2.tar.gz
root/pypi echopop-0.4.2-py3-none-any.whl
root/pypi echopop-0.4.1.tar.gz
root/pypi echopop-0.4.1-py3-none-any.whl
root/pypi echopop-0.4.0.tar.gz
root/pypi echopop-0.4.0-py3-none-any.whl