Small feature request: Humanize dash

[stillawakemedia]

I think it would be beneficial to add the capability for the humanize method to format dashes to make the transition between slugify and humanize easier without having to use the replace method to remove dashes and add spaces.

For example right now I would have to do this:
Stringy::create('some-slug-text')->replace('-', ' ')->humanize()

This would be nice:
Stringy::create('some-slug-text')->humanize()

Not a big deal, just something I do often in a project I am working on.

I can submit a PR for it if you like.