readme: mention OpenCensus

Author: vmihailenco

README.md

@@ -15,10 +15,10 @@
 
 ## Ecosystem
 
-- [redisext](https://github.com/go-redis/redisext) - tracing using OpenTelemetryHook.
+- [redisext](https://github.com/go-redis/redisext) - tracing using OpenTelemetry and OpenCensus.
+- [Distributed Locks](https://github.com/bsm/redislock).
 - [Redis Cache](https://github.com/go-redis/cache).
 - [Rate limiting](https://github.com/go-redis/redis_rate).
-- [Distributed Locks](https://github.com/bsm/redislock).
 
 ## Features