update to version 4.x of redis

[gminorcoles]

Hi, this looks very cool. How much work would it be to upgrade this codebase so that it supports a core "embeddable" set of features in 4.0? I am thinking of modules specifically.

If I had hints about what you did to bend redis into the shape of rlite, I might be able to do the same to redis 4.x.

[seppo0010]

It'd be tons of works. rlite is a rewrite of redis, so implementing modules would require to re implement the same API for rlite.