2.1.0

This release attempts to update missing command
coverage for common datastructures and gets closer
to redis-py version 4.1.0

Feature:

• Added string commands decrby, getdel & getex
• Added list commands lmove, blmove & lpos
• Added set command smismember
• Added sorted set commands zdiff, zdiffstore, zinter, zmscore,
  zpopmin, zpopmax, bzpopmin, bzpopmax & zrandmember
• Added geo commands geosearch, geosearchstore
• Added hash command hrandfield
• Added support for object inspection commands object_encoding, object_freq, object_idletime & object_refcount
• Added lolwut

Chore:

• Standardize linting against black
• Add API documentation
• Add compatibility documentation
• Add CI coverage for redis 6.0