Guess domain name with hyphen(s) correctly

[petermeissner]

Hi! In v0.7.7, robotstxt:::guess_domain("www.some-domain.com") returns www.some, also when prefixing http(s):// or suffixing /some/path/index.html.

see: #56

[petermeissner]

to make the regex in parse_url() more general ...

... instead of (allowing hyphens) ...

stringr::str_match(url, "(^\\w+://)?([\\w.-]+)?(/.*)?")[, -1, drop = FALSE]

... use (only disallowing slashes):

stringr::str_match(url, "(^\\w+://)?([^/]+)?(/.*)?")[, -1, drop = FALSE]