Added the option to measure rtt (#23)

Co-authored-by: fcostaoliveira <filipe@redis.com>

Author: filipecosta90

go.mod

@@ -2,4 +2,7 @@ module github.com/RedisLabs/pubsub-sub-bench
 
 go 1.13
 
-require github.com/redis/go-redis/v9 v9.0.5
+require (
+	github.com/HdrHistogram/hdrhistogram-go v1.1.2 // indirect
+	github.com/redis/go-redis/v9 v9.0.5
+)

go.sum

@@ -1,10 +1,63 @@
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