Add vcr use case for not including hostname in matching

[sckott]

E.g., if you're testing with different base urls, e.g., https://foo.com/api/v1/stuff?q=bird vs. https://bar.com/api/v1/stuff?q=bird - you can set match_requests_on = c("path", "query") to ignore the changing hostname so that when you set different hostnames in different contexts (local machine vs. CI vs. other context) the tests work all the same