Add bslib to DESCRIPTION?

[jsta]

Perhaps I got the yaml header syntax wrong or there's something misconfigured in my R installation, but I needed to install the bslib package or rmarkdown complained that I was passing an input to the yaml header theme.

[djnavarro]

That's a good thought. I might add it as a suggested package. The bs4cards package doesn't technically depend on bslib, but the vast majority of use cases would probably be using the rmarkdown html_document output format, and you do need bslib to make boostrap 4 available in that case. Thanks! I'll address this next time I return to the package!