Support hyphen for url endpoints naming

Hello there.
Thank you for this great library. We found that we can not use endpoints with hyphens, because arc.js uses only underscores for that. But rest naming best practices recommend to use hyphens instead of underscores.

Is it possible to add availability of usage hyphens with/instead of underscores? If not can you answer why?

Thanks

Start by locating the endpoint naming logic in arc.js and inspect how underscores are currently handled. Determine whether hyphens should be accepted alongside or instead of underscores, then verify that the chosen endpoint forms work consistently before considering the issue done.

Written by the indexing model from the issue text.