Update mocha package versions.

[Standard8]

This does a general update of package-lock.json files and also updates mocha everywhere. This helps remove some of the warnings when installing node modules.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.35%. Comparing base (6fc5651) to head (171f89a).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #86   +/-   ##
=======================================
  Coverage   82.35%   82.35%           
=======================================
  Files           1        1           
  Lines          51       51           
=======================================
  Hits           42       42           
  Misses          9        9           

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[azeemba]

Thanks a lot @Standard8!