bump version to 4.3.0

Merge pull request #7 from happybits/andyk/evalsha-support

add support for executing scripts via EVALSHA

bump version to 4.1.0

Merge pull request #6 from happybits/andyk/mypy-fixes

fix a mypy error; update mypy & flake8; drop python 3.7 and 3.8 support

Merge pull request #5 from happybits/72squared-master

sync with upstream (drop py2 support, drop redis-py-cluster support, support newer redis-py versions)

From Khuumi: fixing an issue where iterators were not being treated a…

…s a string (#6)

[bug-fix] fixing an issue where iterators were not being treated as a string

StringListField should return an empty string for an empty list encod…

…ing.

Relaxing validation for fields a little bit and try to just do the ri…

…ght thing.

looks like a bug in pypy3

Introduce Keyspace.super_pipe property.

Allows multiple pipelined functions to share the same parent pipeline.
Don't use this unless you know what you're doing. We will work out the
documentation as we explore the need for this further
and standardize the api.