Add argument for selecting alternative normal approximations

[sethaxen]

Implements #15

[codecov]

Codecov Report

Merging #78 (a55f45d) into main (8e6db0a) will decrease coverage by 0.48%.
The diff coverage is 88.57%.

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
- Coverage   92.89%   92.40%   -0.49%     
==========================================
  Files          13       13              
  Lines         521      527       +6     
==========================================
+ Hits          484      487       +3     
- Misses         37       40       +3     

Impacted Files	Coverage Δ
src/multipath.jl	66.66% <ø> (ø)
src/singlepath.jl	85.91% <81.25%> (-3.56%)	⬇️
src/elbo.jl	81.81% <94.73%> (+4.54%)	⬆️

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[codecov-commenter]

Codecov Report

Base: 87.86% // Head: 87.42% // Decreases project coverage by -0.43% ⚠️

Coverage data is based on head (135033f) compared to base (8b3d6c0).
Patch coverage: 88.57% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
- Coverage   87.86%   87.42%   -0.44%     
==========================================
  Files          13       13              
  Lines         519      525       +6     
==========================================
+ Hits          456      459       +3     
- Misses         63       66       +3     

Impacted Files	Coverage Δ
src/multipath.jl	66.66% <ø> (ø)
src/singlepath.jl	86.11% <81.25%> (-3.50%)	⬇️
src/elbo.jl	81.81% <94.73%> (+4.54%)	⬆️

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