Use new CITATION format preferred by r-devel (Closes #1249)

[eddelbuettel]

The CITATION format changed, r-devel now nags. I took a look at one of the packages by Kurt Hornik before I made a first change (to RcppArmadillo); this follows the same patter.

It now looks like this:

edd@rob:~/git/rcpp(feature/update_citation)$ r -pe'citation(package="Rcpp")'

To cite package ‘Rcpp’ in publications use:

  Eddelbuettel D, Francois R, Allaire J, Ushey K, Kou Q, Russell N, Ucar I, Bates D, Chambers J (2023). _Rcpp: Seamless R and C++ Integration_. https://www.rcpp.org,
  https://dirk.eddelbuettel.com/code/rcpp.html, https://github.com/RcppCore/Rcpp.

  Eddelbuettel D, François R (2011). “Rcpp: Seamless R and C++ Integration.” _Journal of Statistical Software_, *40*(8), 1-18. doi:10.18637/jss.v040.i08
  <https://doi.org/10.18637/jss.v040.i08>.

  Eddelbuettel D (2013). _Seamless R and C++ Integration with Rcpp_. Springer, New York. doi:10.1007/978-1-4614-6868-4 <https://doi.org/10.1007/978-1-4614-6868-4>, ISBN
  978-1-4614-6867-7.

  Eddelbuettel D, Balamuta J (2018). “Extending R with C++: A Brief Introduction to Rcpp.” _The American Statistician_, *72*(1), 28-36. doi:10.1080/00031305.2017.1375990
  <https://doi.org/10.1080/00031305.2017.1375990>.

To see these entries in BibTeX format, use 'print(<citation>, bibtex=TRUE)', 'toBibtex(.)', or set 'options(citation.bibtex.max=999)'.

edd@rob:~/git/rcpp(feature/update_citation)$ 

Paging @coatless who is in there (I used your Illinois email and followed your RcppEnmallen DESCRIPTION). I am not quite convinced an email is needed when the ORCiD is there. Ah well.

Checklist

• Code compiles correctly
• R CMD check still passes all tests
• Prefereably, new tests were added which fail without the change
• Document the changes by file in ChangeLog

[Enchufa2]

LGTM!

[eddelbuettel]

Thanks!

Will merge this now so that I can move on to #1251; if we need edits to the file we can always make them.

[coatless]

Looks good! Thanks for pulling the information from RcppEnsmallen!