phpredis 5.3.5

This release adds support for various exponential backoff strategies as
well as experimental support for automatically detecting dirty
persistent connections.

You can find a detailed list of changes in Changelog.md and package.xml

* Sponsors
  ~ Audiomack - https://audiomack.com
  ~ Open LMS - https://openlms.net
  ~ BlueHost - https://bluehost.com
  ~ Object Cache Pro for WordPress - https://objectcache.pro
  ~ Avtandil Kikabidze - https://github.com/akalongman
  ~ Zaher Ghaibeh - https://github.com/zaherg
  ~ BatchLabs - https://batch.com
  ~ Luis Zárate - https://github.com/jlzaratec