Update release notes for 0.2.2
Update release notes for 0.2.2

Change-Id: I59cbee4c147d5f849a7f07224e83ddd751212077

citrix-openstack-build/python-openstackclient,BjoernT/python-openstackclient,openstack/python-openstackclient,varunarya10/python-openstackclient,derekchiang/python-openstackclient,redhat-openstack/python-openstackclient,redhat-openstack/python-openstackclient,BjoernT/python-openstackclient,dtroyer/python-openstackclient,metacloud/python-openstackclient,varunarya10/python-openstackclient,openstack/python-openstackclient,derekchiang/python-openstackclient,dtroyer/python-openstackclient,citrix-openstack-build/python-openstackclient,metacloud/python-openstackclient