RcppArmadillo 0.12.8.0.0

[eddelbuettel]

As CRAN writes

Dear maintainer,

thanks, package RcppArmadillo_0.12.8.0.0.tar.gz is on its way to CRAN.

Best regards,
CRAN teams' auto-check service

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Package check result: OK

No changes to worse in reverse depends.

Can't complain about that with 1100+ reverse depends. Which corrobates our earlier reverse-depends check done yesterday.