Use ^ in mocha dep

[cgewecke]

Fixes #813

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (fb5fd6e) 96.47% compared to head (873e93f) 96.47%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #814   +/-   ##
=======================================
  Coverage   96.47%   96.47%           
=======================================
  Files          19       19           
  Lines        1049     1049           
=======================================
  Hits         1012     1012           
  Misses         37       37           

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