`str_wrap()` flexibility - use "<br>"

[jack-davison]

Hi tidyverse team,

A very minor suggestion - str_wrap() is very useful, but it appears that it enforces "\n" as the wrapping character. Is it possible to expose the choice of the 'wrapping' string to the user?

My specific use case is that I might want to use it in htmlwidgets-type work (e.g., leaflet legends), and I'd quite like to use "
" instead.

Happy to put together a PR if needed and this is considered 'in scope'.

Best,
Jack

[hadley]

Sorry, I think this is out of scope for stringr since it's HTML specific.