Add link to Redis Mock

Author: vmihailenco

README.md

@@ -15,6 +15,7 @@
 
 ## Ecosystem
 
+- [Redis Mock](https://github.com/go-redis/redismock).
 - [Distributed Locks](https://github.com/bsm/redislock).
 - [Redis Cache](https://github.com/go-redis/cache).
 - [Rate limiting](https://github.com/go-redis/redis_rate).