Dominic Page

Hi @vseloved This PR adds [BITFIELD](https://redis.io/commands/bitfield/) (available since 3.2.0) and [BITFIELD_RO](https://redis.io/commands/bitfield/ and https://redis.io/commands/bitfield_ro/) (available since 6.0.0) to the client. I've added tests with expected output based on expressions I ran...

Got this error: ``` clojure.lang.Compiler$CompilerException: Syntax error macroexpanding clojure.core/fn at (clojure/core/unify.clj:83:18). #:clojure.error{:phase :macro-syntax-check, :line 83, :column 18, :source "clojure/core/unify.clj", :symbol clojure.core/fn} ``` workaround (not really fix) was downgrade `lein` ```...