Fix entropy of Dirichlet

[devmotion]

This PR fixes #1270 that was introduced in #1243. I also added tests.

I bumped the version such that a bugfix release can be made available as soon as the PR is merged.

[codecov-io]

Codecov Report

Merging #1271 (003db0d) into master (863844c) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1271      +/-   ##
==========================================
+ Coverage   81.29%   81.36%   +0.06%     
==========================================
  Files         117      117              
  Lines        6566     6568       +2     
==========================================
+ Hits         5338     5344       +6     
+ Misses       1228     1224       -4     

Impacted Files	Coverage Δ
src/multivariate/dirichlet.jl	64.89% <100.00%> (+2.52%)	⬆️

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[devmotion]

Bump 🙂