ReCAPTCHA settings null after using AddRecaptcha options

Hi…

Your fix for #60 has worked so far as it stops the application from crashing on runtime, however it seems the settings set using the options method do not persist when they are injected into a controller…

Read me example being used:

// Or configure recaptcha via options
services.AddRecaptcha(options =>
{
    options.SecretKey = "Your secret key";
    options.SiteKey = "Your site key";
});

I noticed this issue when trying to validate responses. The Validate(code) method was returning a new response object with all fields set to the default value. It may be worth throwing some sort of exception if a validation is attempted without a secret key…

[TimothyMeadows]

This is now fixed in 3.0.5.

[mo-esmp]

Yes, I removed IOptions but you rolled back code to IOptions. I added some integration tests to validate captcha registration and I think it worth to run tests after any change.