fix: client should be able to subscribe multiple channels for Pub/Sub… #512

Job	Run time
Lint	23s
Massive Cluster	2m 27s
Benchmark	2m 56s
Main (7.0, 3.2)	58s
Main (7.0, 3.2, compose.ssl.yaml)	1m 3s
Main (7.0, 3.2, hiredis)	55s
Main (7.0, 3.2, hiredis, compose.ssl.yaml)	1m 10s
Main (7.0, 3.2, 2, compose.replica.yaml)	59s
Main (7.0, 3.2, compose.auth.yaml)	1m 3s
Main (6.2, 3.1)	56s
Main (6.2, 3.0)	1m 1s
Main (5.0, 2.7)	1m 26s
Main (jruby)	1m 33s
Main (truffleruby)	1m 30s
Main (test_cluster_state, 7.0, 2, compose.replica.yaml)	3m 13s
Main (test_cluster_state, 6.2, 2, compose.replica.yaml)	3m 3s
Main (test_cluster_broken, 7.0, no)	2m 2s
Main (test_cluster_broken, 6.2, no)	2m 20s
Main (test_cluster_scale, 7.0, compose.scale.yaml)	1m 52s
Main (test_cluster_scale, 6.2, compose.scale.yaml)	1m 55s
NAT-ted Environments	54s
Profiling (single)	46s
Profiling (excessive_pipelining)	46s
Profiling (pipelining_in_moderation)	38s
	35m 49s

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