fix: make log severity type safe

[sergiud]

Fixes #590

[codecov-commenter]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (51e7a43) 58.75% compared to head (2f5e950) 59.01%.

Files	Patch %	Lines
src/logging.cc	53.33%	7 Missing ⚠️
src/signalhandler.cc	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1025      +/-   ##
==========================================
+ Coverage   58.75%   59.01%   +0.26%     
==========================================
  Files          18       18              
  Lines        2560     2550      -10     
  Branches      918      912       -6     
==========================================
+ Hits         1504     1505       +1     
+ Misses        707      701       -6     
+ Partials      349      344       -5     

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