release 0.3.0 version

• Support redisClustervCommand, redisClustervAppendCommand and redisClustervAsyncCommand api. (deep011)
• Add flags HIRCLUSTER_FLAG_ADD_OPENSLOT and HIRCLUSTER_FLAG_ROUTE_USE_SLOTS. (deep011)
• Support redisClusterCommandArgv related api. (deep011)
• Fix some serious bugs. (deep011)

release 0.2.1 version

support cluster synchronous API

support multi-key command(mget/mset/del) for redis cluster

support cluster pipelining

support cluster asynchronous API