Initialize options of RequestLocalizationMiddleware in Invoke instead of constructor

Could you change the initialization of the options from the constructor into `Invoke()`?

The reason behind is that in the property `Value` the Options is initialized inside the constructor, but if the property access would be done in `Invoke()` the initialization will be during a request.

```cs
public class RequestLocalizationMiddleware
{
private readonly IOptions _options;

public RequestLocalizationMiddleware(RequestDelegate next, IOptions options)
{
_options = options;
}

public async Task Invoke(HttpContext context)
{
var options = _options.Value; // Now the value is created here instead of the constructor
}
}
```

See

In my case I load the options from a database and I do not want to do it during startup ... and I cannot change that.