Use Julia's standard debug loggin mechanism instead of the custom verbose flag.

[andreasnoack]

Minor thing but I think it's nicer to use the default logging machinery for this.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.95%. Comparing base (f6f4f70) to head (d978dd0).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/glmfit.jl	75.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #579   +/-   ##
=======================================
  Coverage   89.95%   89.95%           
=======================================
  Files           8        8           
  Lines        1105     1105           
=======================================
  Hits          994      994           
  Misses        111      111           

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