Use `Imports` rather than `Suggests` in `DESCRIPTION` file

[dongzhuoer]

I install your package using

devtools::install_github("bergant/datamodelr")

But when I call dm_render_graph(), I get a error telling me to install DiagrammeR.

[dongzhuoer]

I suggest that you read this article, in summary

Imports: packages listed here must be present for your package to work.
Suggests: your package can use these packages, but doesn’t require them.

[cjtexas]

I just did a fresh install and this is still an issue 🧐