This is interim release which contains only bug fixes.
* Fix segfault when extending Redis class in PHP 5 [d23eff] (Pavlo Yatsukhnenko)
* Fix RedisCluster constructor with PHP 7 strict scalar type [5c21d7] (Pavlo Yatsukhnenko)
* Allow to use empty string as persistant_id [344de5] (Pavlo Yatsukhnenko)
* Fix cluster_init_seeds. [db1347] (@adlagares)
* Fix z_seeds may be a reference [42581a] (@janic716)