CompatHelper: bump compat for "StatsFuns" to "1"

[github-actions]

This pull request changes the compat entry for the StatsFuns package from 0.9 to 0.9, 1.

This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry. It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov-commenter]

Codecov Report

Merging #28 (ad137bb) into master (fa82dbc) will decrease coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
- Coverage   90.66%   90.57%   -0.09%     
==========================================
  Files          28       28              
  Lines        3674     3640      -34     
==========================================
- Hits         3331     3297      -34     
  Misses        343      343              

Impacted Files	Coverage Δ
...rc/parameter_estimation/component_loglikelihood.jl	80.00% <0.00%> (-0.96%)	⬇️
src/generate_random_deviates/continuous_rand.jl	82.40% <0.00%> (-0.42%)	⬇️
src/parameter_estimation/inference_ci.jl	96.89% <0.00%> (-0.22%)	⬇️
...parameter_estimation/update_sigma_and_residuals.jl	81.29% <0.00%> (-0.18%)	⬇️
src/generate_random_deviates/discrete_rand.jl	84.44% <0.00%> (-0.18%)	⬇️
src/parameter_estimation/fit_nb.jl	89.28% <0.00%> (-0.16%)	⬇️
src/parameter_estimation/gaussian_CS.jl	91.34% <0.00%> (-0.09%)	⬇️
src/parameter_estimation/gaussian_AR.jl	91.58% <0.00%> (-0.08%)	⬇️
src/parameter_estimation/fit_glm_ar_cs.jl	97.18% <0.00%> (-0.06%)	⬇️
src/parameter_estimation/fit_gaussian_vc.jl	95.29% <0.00%> (-0.06%)	⬇️
... and 2 more

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