Implement Feedback on failed authentication

[smstuebe]

If the finger was not recognized, visualize the failure with a shaking icon or displaying the error text.

[arctouch-oberdanbitencourt]

Hi! I'm using your plugin and want to provide feedback to the user when their finger is not recognized, just like iOS TouchId does. Do you have any plans on this to the near future? Also, do you recommend a way of doing it?

[smstuebe]

It's a planned todo. I can't guarantee, that I'll implement it in the near future, because the next priority on my list is pushing our BLE plugin to 1.0 stable ^^

[smstuebe]

@arctouch-oberdanbitencourt version 1.3.0-beta1 gives feedback on failed auth.