Add ability to blur all digits in the scanned card image, minus any number of digits to remain unblurred, enabled via CardIOActivity.EXTRA_UNBLUR_DIGITS. (Thank you Michael Schmoock!)
Fix issue where Maestro cards were not correctly recognized #154.
Fix issue on Android 23 and above where CardIOActivity#canReadCardWithCamera() would return the incorrect value if permissions had not been granted #136. Now defaults to true in such cases.