Use redis universal client in token bucket

[BrianLeishman]

Updated the client to a UniversalClient, which works for redis pools as well as single redis servers.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.51%. Comparing base (50bb6c3) to head (844d499).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #34   +/-   ##
=======================================
  Coverage   83.51%   83.51%           
=======================================
  Files          10       10           
  Lines        1468     1468           
=======================================
  Hits         1226     1226           
  Misses        169      169           
  Partials       73       73           

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[mennanov]

Please update all the references to *redits.Client to redis.UniversalClient in other files too: concurrent_buffer.go, slidingwindow.go and so on.

Thanks!

[BrianLeishman]

@mennanov makes sense to me, done!

[mennanov]

Thanks for contributing!