Merge pull request redis#688 from go-redis/fix/random-node

Pick random node when command does not have keys

Merge pull request redis#683 from sudhirj/feature/universal_subscript…

…ions

Added subscription interfaces to universal client

Merge pull request redis#667 from laouji/666-add-smembers-map-cmd

Add SMembersMap command

Merge pull request redis#663 from go-redis/fix/slice-next-elem

Fix slice next elem func

Merge pull request redis#654 from go-redis/fix/pool-panic

Fix pool panics

Merge pull request redis#648 from go-redis/fix/cmd-timeout

Increase read timeout for blocking commands and don't retry such commands

Merge pull request redis#639 from go-redis/fix/misses

Replace PoolStats.Requests with PoolStats.Misses

Merge pull request redis#636 from go-redis/fix/pool-stats-alias

PoolStats is an alias for pool.Stats

Merge pull request redis#630 from go-redis/fix/pipeline-retrying

Rework pipeline retrying

Merge pull request redis#623 from go-redis/feature/zlexcount

Add ZLexCount