root/pypi: links for usage-tracker

root/pypi usage_tracker-0.4.0.tar.gz
root/pypi usage_tracker-0.4.0-py3-none-any.whl
root/pypi usage_tracker-0.3.0.tar.gz
root/pypi usage_tracker-0.3.0-py3-none-any.whl
root/pypi usage_tracker-0.2.0.tar.gz
root/pypi usage_tracker-0.2.0-py3-none-any.whl
root/pypi usage_tracker-0.1.0.tar.gz
root/pypi usage_tracker-0.1.0-py3-none-any.whl