Minor updates to README

2.0.1

Update README.md

4/8 bit support, error callback

Major version bump due to minor API changes.

Support for 4/8 bits modes

PCInt example

1.0.1

New sample using YetAnotherArduinoPcIntLibrary

First version

1.0.0

Since some versions of Wiegand have payloads that are not multiple of…