Check projpred version for latent projection

[fweber144]

I realized that in #1451, I could have checked the projpred version that is required for the latent projection directly in the code. Sorry, I have implemented this now (and also added corresponding documentation at argument latent; #1451 did so only in the NEWS entry).

[paul-buerkner]

Good point. Brms has the require_package function for this purpose.

[codecov-commenter]

Codecov Report

Merging #1456 (1698d27) into master (1d4cb43) will decrease coverage by 0.02%.
The diff coverage is 12.50%.

❗ Current head 1698d27 differs from pull request most recent head 75cedce. Consider uploading reports for the commit 75cedce to get more accurate results

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@@            Coverage Diff             @@
##           master    #1456      +/-   ##
==========================================
- Coverage   82.06%   82.05%   -0.02%     
==========================================
  Files          70       70              
  Lines       19720    19724       +4     
==========================================
+ Hits        16183    16184       +1     
- Misses       3537     3540       +3     

Impacted Files	Coverage Δ
R/projpred.R	0.00% <0.00%> (ø)
R/data-response.R	89.43% <33.33%> (-0.44%)	⬇️

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[fweber144]

Thanks, I switched to require_package() (commit 75cedce). Since require_package() uses < instead of <=, I consistently switched to projpred version 2.4.0 as cutoff instead of 2.3.0 (on CRAN, there is no projpred version between 2.3.0 and 2.4.0).

[paul-buerkner]

Perfect, thank you!