v7.1.0

Added ability to configure the base API URL through the HttpClient:

var httpClient = new HttpClient {BaseAddress = new Uri("https://ob.gocardless.com/api/v2/")};
var credentials = new NordigenClientCredentials("...", "...");
var client = new NordigenClient(httpClient, credentials);

Full Changelog: v7.0.0...v7.1.0