Help with py-tz download location

[Adam Mercer]

Hi

py-tz has been updated, to version 2016.4) and it seems that the
download location for the source has changed, it now seems to include
some kind of hash in the URL and I can't workout how to specify this
in the Portfile besides using:

master_sites https://pypi.python.org/packages/f4/7d/7c0c85e9c64a75dde11bc9d3e1adc4e09a42ce7cdb873baffa1598118709

Does anyone know of a neater way to do this?

Cheers

Adam