Update README
Update README

Added mention of ssl-phpredis as a client for SSL based redis.
bbroerman30/ssl-redis,tritondigital/ssl-redis,tritondigital/ssl-redis,tritondigital/ssl-redis,tritondigital/ssl-redis,bbroerman30/ssl-redis,tritondigital/ssl-redis,tritondigital/ssl-redis,tritondigital/ssl-redis,bbroerman30/ssl-redis