document redis_version parameter
document redis_version parameter

rackspace-orchestration-templates/redis-sentinel,brint/redis-sentinel,brint/redis-sentinel,pratikmallya/redis-sentinel,rackspace-orchestration-templates/redis-sentinel,brint/redis-sentinel,rackspace-orchestration-templates/redis-sentinel,pratikmallya/redis-sentinel,rackspace-orchestration-templates/redis-sentinel,pratikmallya/redis-sentinel,brint/redis-sentinel,pratikmallya/redis-sentinel