Return record instead of using mongodb return value.

[dlongley]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.95%. Comparing base (6969a7e) to head (c14fdc6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #88   +/-   ##
=======================================
  Coverage   79.95%   79.95%           
=======================================
  Files          12       12           
  Lines        1906     1906           
=======================================
  Hits         1524     1524           
  Misses        382      382           

Files with missing lines	Coverage Δ
lib/challenges.js	87.30% <100.00%> (ø)

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