Add response family/distribution to GLMM type parameter

[palday]

Closes #463

[codecov]

Codecov Report

Merging #490 (4ad5555) into master (606ff9d) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 4ad5555 differs from pull request most recent head 7bf2899. Consider uploading reports for the commit 7bf2899 to get more accurate results

@@           Coverage Diff           @@
##           master     #490   +/-   ##
=======================================
  Coverage   93.95%   93.95%           
=======================================
  Files          27       27           
  Lines        2151     2152    +1     
=======================================
+ Hits         2021     2022    +1     
  Misses        130      130           

Impacted Files	Coverage Δ
src/generalizedlinearmixedmodel.jl	89.23% <100.00%> (+0.07%)	⬆️
src/likelihoodratiotest.jl	97.61% <100.00%> (-0.03%)	⬇️

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[dmbates]

Shall we merge this now?

[palday]

I need to add a NEWS entry 😊 . I'll merge shortly

[dmbates]

Okay, thanks.