Allow zero indexed keys on RangeAggregation

[Syntaf]

Allow '0' as a valid key for RangeAggregation objects

[Syntaf]

@saimaz 👋 do you have a moment to take a look at this bugfix? Thanks!

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.67%. Comparing base (b4c3c89) to head (4bc0fa1).

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Additional details and impacted files

@@            Coverage Diff            @@
##             master     #316   +/-   ##
=========================================
  Coverage     78.67%   78.67%           
  Complexity      736      736           
=========================================
  Files           123      123           
  Lines          1899     1899           
=========================================
  Hits           1494     1494           
  Misses          405      405           

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