Add divergence()

[koheiw]

Add divergence() for #26 .

[codecov[bot]]

Codecov Report

Merging #27 (857f9f9) into master (d887712) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   98.76%   98.78%   +0.02%     
==========================================
  Files           5        6       +1     
  Lines         243      247       +4     
==========================================
+ Hits          240      244       +4     
  Misses          3        3              

Impacted Files	Coverage Δ
R/utils.R	100.00% <100.00%> (ø)

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[koheiw]

@contefranz If you are happy with the divergence(), please approve this PR.

[contefranz]

@contefranz If you are happy with the divergence(), please approve this PR.

I am happy, but left a comment on it. How about adding a similar method for the seededlda method and not just the lda? If you want to split the work in two, I'll approve the PR. Just let me know.

[koheiw]

I think I cannot see your comments until you click "Request change".

[koheiw]

Thanks!