Coredis

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* Fixbug: parsing stream messgae with empty payload will cause error(116)
* Fixbug: Let ClusterConnectionPool handle skip_full_coverage_check (118)
* New: threading local issue in coroutine, use contextvars instead of threading local in case of the safety of thread local mechanism being broken by coroutine (120)
* New: support Python 3.8

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* new: Dev conn pool max idle time (111) release connection if max-idle-time exceeded
* update: discard travis-CI
* Fix bug: new stream id used for test_streams

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* fix bug: fix cluster port parsing for redis 4+(node info)
* fix bug: wrong parse method of scan_iter in cluster mode
* fix bug: When using "zrange" with "desc=True" parameter, it returns a coroutine without "await"
* fix bug: do not use stream_timeout in the PubSubWorkerThread
* opt: add socket_keepalive options
* new: add ssl param in get_redis_link to support ssl mode
* new: add ssl_context to StrictRedis constructor and make it higher priority than ssl parameter

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* allow use of zadd options for zadd in sorted sets
* fix bug: use inspect.isawaitable instead of typing.Awaitable to judge if an object is awaitable
* fix bug: implicitly disconnection on cancelled error (84)
* new: add support for `streams`(including commands not officially released, see `streams <http://aredis.readthedocs.io/en/latest/streams.html>`_ )

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* fix bug: redis command encoding bug
* optimization: sync change on acquring lock from redis-py
* fix bug: decrement connection count on connection disconnected
* fix bug: optimize code proceed single node slots
* fix bug: initiation error of aws cluster client caused by not appropiate function list used
* fix bug: use `ssl_context` instead of ssl_keyfile,ssl_certfile,ssl_cert_reqs,ssl_ca_certs in intialization of connection_pool

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* fix bug: connection with unread response being released to connection pool will lead to parse error, now this kind of connection will be destructed directly. `52 <https://github.com/NoneGG/aredis/issues/52>`_
* fix bug: remove Connection.can_read check which may lead to block in awaiting pubsub message. Connection.can_read api will be deprecated in next release. `56 <https://github.com/NoneGG/aredis/issues/56>`_
* add c extension to speedup crc16, which will speedup cluster slot hashing
* add error handling for asyncio.futures.Cancelled error, which may cause error in response parsing.
* sync optimization of client list made by swilly22 from redis-py
* add support for distributed lock using redis cluster

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