root/pypi: links for airtight

root/pypi airtight-0.2.0.tar.gz
root/pypi airtight-0.2.0a3.tar.gz
root/pypi airtight-0.2.0a2.tar.gz
root/pypi airtight-0.2.0a1.tar.gz
root/pypi airtight-0.1.tar.gz