fix MvNormal bug

[cscherrer]

Fixes #188

[github-actions]

Package name	latest	stable
Mitosis.jl
Soss.jl

[codecov]

Codecov Report

Merging #189 (49f47cb) into master (7cda008) will increase coverage by 0.18%.
The diff coverage is 100.00%.

❗ Current head 49f47cb differs from pull request most recent head a9e74cb. Consider uploading reports for the commit a9e74cb to get more accurate results

@@            Coverage Diff             @@
##           master     #189      +/-   ##
==========================================
+ Coverage   47.14%   47.32%   +0.18%     
==========================================
  Files          39       39              
  Lines        1084     1084              
==========================================
+ Hits          511      513       +2     
+ Misses        573      571       -2     

Impacted Files	Coverage Δ
src/combinators/affine.jl	50.72% <100.00%> (+1.44%)	⬆️

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[github-actions]

Package name	latest	stable
Mitosis.jl
Soss.jl