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: Iecf9266b8068be5288fe006987a2c0e0db29c1d5

README.rst

@@ -12,11 +12,11 @@ os-vif
 ======
 
 .. image:: https://img.shields.io/pypi/v/os-vif.svg
-    :target: https://pypi.python.org/pypi/os-vif/
+    :target: https://pypi.org/project/os-vif/
     :alt: Latest Version
 
 .. image:: https://img.shields.io/pypi/dm/os-vif.svg
-    :target: https://pypi.python.org/pypi/os-vif/
+    :target: https://pypi.org/project/os-vif/
     :alt: Downloads
 
 A library for plugging and unplugging virtual interfaces in OpenStack.