Add PR to HMAC_DRBG base class

[mborland]

Closes: #96

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.72%. Comparing base (787fcc7) to head (41b06d7).
Report is 7 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #98      +/-   ##
===========================================
- Coverage   100.00%   99.72%   -0.28%     
===========================================
  Files           82       82              
  Lines         3903     3953      +50     
  Branches       507      535      +28     
===========================================
+ Hits          3903     3942      +39     
- Misses           0       11      +11     

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