Add support for redis-py 4.2.0

[ca-simone-chiorazzo]

It would be great to have support for the new release of redis-py, that now includes also aioredis.

I've tried to install it, but I've got the following compatibility error

pip install fakeredis==1.7.1
...
The conflict is caused by:
    <my_package> depends on redis>=4.2.0
    fakeredis 1.7.1 depends on redis<4.2.0

[cunla]

Fixed on v1.7.4 published from here: https://github.com/dsoftwareinc/fakeredis-py.
@bmerry this can be closed

[bmerry]

fakeredis 1.7.4 now supports redis-py 4.2.2.

[ca-simone-chiorazzo]

Awesome! Thanks :)