Fix typo in README.rst
Fix typo in README.rst

There is one wrong word in README.rst, it should be updated.

Change-Id: I6cfa4b36ff6a516aded084f6b27c84182de75524

ramineni/my_congress,openstack/congress,ramineni/my_congress,openstack/congress,ramineni/my_congress,ramineni/my_congress