feat: support ioredis as underlying client

[mmkal]

[codecov-io]

Codecov Report

Merging #241 (24ae4e8) into master (cd44850) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #241   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         5    +1     
  Lines           59        64    +5     
  Branches         7         8    +1     
=========================================
+ Hits            59        64    +5     

Impacted Files	Coverage Δ
src/index.ts	100.00% <100.00%> (ø)
src/ioredis/index.ts	100.00% <100.00%> (ø)

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