Makefile should return a failure on failure

[kevinstratford]

Following #330

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 30.61%. Comparing base (a8f90a6) to head (36cc95d).
Report is 87 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #336      +/-   ##
===========================================
- Coverage    31.24%   30.61%   -0.64%     
===========================================
  Files          189      192       +3     
  Lines        34780    34484     -296     
  Branches       881      880       -1     
===========================================
- Hits         10866    10556     -310     
- Misses       23735    23753      +18     
+ Partials       179      175       -4     

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