Trivial: Update pypi url to new url
Trivial: Update pypi url to new url

Pypi url changed from [1] to [2]

[1] https://pypi.python.org/pypi/<package>
[2] https://pypi.org/project/<package>

Change-Id: Iba3c4bb36b258e551504cbc25a9efdbefe705b6e

openstack/python-magnumclient