Stable version of logpdf

[codecov[bot]]

Codecov Report

Base: 74.05% // Head: 74.78% // Increases project coverage by +0.72% :tada:

Coverage data is based on head (ec0c313) compared to base (fb0e36d). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #49 +/- ## ========================================== + Coverage 74.05% 74.78% +0.72% ========================================== Files 17 17 Lines 663 682 +19 ========================================== + Hits 491 510 +19 Misses 172 172 ``` | [Impacted Files](https://codecov.io/gh/JuliaGaussianProcesses/AugmentedGPLikelihoods.jl/pull/49?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaGaussianProcesses) | Coverage Δ | | |---|---|---| | [src/SpecialDistributions/polyagamma.jl](https://codecov.io/gh/JuliaGaussianProcesses/AugmentedGPLikelihoods.jl/pull/49?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaGaussianProcesses#diff-c3JjL1NwZWNpYWxEaXN0cmlidXRpb25zL3BvbHlhZ2FtbWEuamw=) | `92.85% <100.00%> (+1.12%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaGaussianProcesses). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaGaussianProcesses)

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[rhaps0dy]

You should also merge this branch now @theogf