root/pypi: links for libmetric

root/pypi libmetric-0.6.0.linux-x86_64.tar.gz
root/pypi libmetric-0.5.0.linux-x86_64.tar.gz
root/pypi libmetric-0.3.0.linux-x86_64.tar.gz
root/pypi libmetric-0.1.0.tar.gz