RestInterfaceClient should follow redirection

[Geod24]

Currently, getting a 301 (e.g. when using http://example.com and being redirected by an Nginx front to https://example.com, which is a very common scenario) leads to RestInterfaceClient throwing:

vibe.d/web/vibe/web/rest.d

Lines 2077 to 2085 in 40fee14

	if (!isSuccessCode(cast(HTTPStatus)client_res.statusCode))
	{
	Json msg = Json(["statusMessage": Json(client_res.statusPhrase)]);
	if (client_res.contentType.length)
	if (client_res.contentType.splitter(";").front.strip.sicmp("application/json") == 0)
	msg = client_res.readJson();
	client_res.dropBody();
	throw new RestException(client_res.statusCode, msg);
	}

Because 200 <= isSuccessCode < 300.