Add boto3 as a dependency

[ceb10n]

fix #4

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (3a2551b) to head (4659793).

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Additional details and impacted files

@@            Coverage Diff            @@
##            master        #5   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          107       107           
  Branches        10        10           
=========================================
  Hits           107       107           

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