Arcus Server 1.13.1

2021-03-15 [version 1.13.1]

* [FEATURE] support nested prefix. (not yet enabled)
* [FEATURE] added "stats persistence" command.
* [FEATURE] added config command for changing the persistence settings.
* [FEATURE] support zookeeper dynamic reconfiguration. (Not default)
* [IMPROVE] implemented slow hash table expansion.
* [FIX]     resolve compilation in the latest linux version.
* [FIX]     expire immediately if the given time is in past.
* [FIX]     flushed the log records remaining in buffer in async mode.
* [DOC]     added description for persistence stats.
* [DOC]     added description for unreadable attribute.
* [CLEANUP] refactored arcus_zk and cluster_config modules.