Update Oslo wiki link in README

Use lastest Oslo wiki link.

Change-Id: I7f9590804448c9fe2273374b3174a3f45fbf0aae
Merge "Update Oslo wiki link in README"
(Test commit) Change README to reflect Jio's fork of Cinder

Change-Id: I3f26c0a736e63725aec24ca2fa12c707b8e6460f