Update release notes
Update release notes

Change-Id: I3a69294a92179be7af699490c76cc9217f6c440c
Reviewed-on: http://review.couchbase.org/51143
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>
Tested-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>

dewolfe/couchbase-ruby-client,dewolfe/couchbase-ruby-client