Signal to user to run `download_fontawesome(version = "dev")`

[ddsjoberg]

Hello! Thank you for making these cute icons easily available to us!

I recently got a new computer, and was running some old scripts that use the icons pkg. I kept seeing an error from icons::fontawesome("twitter") that there was a subscript out of bounds. The solution was to first run download_fontawesome(version = "dev"), but I was pretty confused for quite a while before remembering about this step.

I think it would be helpful if there was some error messaging reminding users this may be the solution. Perhaps something like this?

icons::fontawesome("twitter")
#> Error: Subscript out of bounds
#> Have you run `download_fontawesome(version = "dev")` already?

Thanks again!

PS I am on Windows 10 if that matters