Update redis to 2.10.6

[pyup-bot]

This PR updates redis from 2.10.5 to 2.10.6.

Changelog

2.10.6

* Various performance improvements. Thanks cjsimpson
 * Fixed a bug with SRANDMEMBER where
 * Added HSTRLEN command. Thanks Alexander Putilin
 * Added the TOUCH command. Thanks Anis Jonischkeit
 * Remove unnecessary calls to the server when registering Lua scripts.
   Thanks Ben Greenberg
 * SET's EX and PX arguments now allow values of zero. Thanks huangqiyin
 * Added PUBSUB {CHANNELS, NUMPAT, NUMSUB} commands. Thanks Angus Pearson
 * PubSub connections that that encounter `InterruptedError`s now
   retry automatically. Thanks Carlton Gibson and Seth M. Larson
 * LPUSH and RPUSH commands run on PyPy now correctly returns the number
   of items of the list. Thanks Jeong YunWon
 * Added support to automatically retry socket EINTR errors. Thanks
   Thomas Steinacher
 * PubSubWorker threads started with `run_in_thread` are now daemonized
   so the thread shuts down when the running process goes away. Thanks
   Keith Ainsworth
 * Added support for GEO commands. Thanks Pau Freixes, Alex DeBrie and
   Abraham Toriz
 * Made client construction from URLs smarter. Thanks Tim Savage
 * Added support for CLUSTER * commands. Thanks Andy Huang
 * The RESTORE command now accepts an optional `replace` boolean.
   Thanks Yoshinari Takaoka
 * Attempt to connect to a new Sentinel if a TimeoutError occurs. Thanks
   Bo Lopker
 * Fixed a bug in the client's `__getitem__` where a KeyError would be
   raised if the value returned by the server is an empty string.
   Thanks Javier Candeira.
 * Socket timeouts when connecting to a server are now properly raised
   as TimeoutErrors.

Links

• PyPI: https://pypi.org/project/redis
• Changelog: https://pyup.io/changelogs/redis/
• Repo: http://github.com/andymccurdy/redis-py