v2.2.1

This release adds a fix for issues with the Fingerprint API on Android Oreo not reporting KeyPermanentlyInvalidatedException. Devices on Android Oreo were seen incorrectly reporting IllegalBlockSizeException which now gets mapped to the KeyPermanentlyInvalidatedException.

Improvements:

• #71 Fix Android Oreo not reporting KeyPermanentlyInvalidatedException correctly.
• #73 Implement toString() for Fingerprint result classes.