less verbose way to get base_url from env::args

[vbauerster]

That's a matter of taste, but imho it's a more idiomatic way to get single positional arg.

Following is just for history, if one don't want to allocate "localhost" on the heap. However using Cow in the context of this example is a bit of overkill.

let base_url = env::args().nth(1).map_or(Cow::from("localhost"), Cow::from);

[cfsamson]

Thanks, this change was a result of pr #19 to make it work with docker for Mac users. I agree that the shorter the better 👍