Revision history for Perl extension RPi::WiringPi.

0.02    2016-08-10
        - implemented getAlt() in Core, and in Pin, mode() with no params
          now returns the current mode of the pin
        - added cleanup()

0.01    2016-08-10
        - initial prototype release
        - added Pin.pm
        - added error checking
        - first round of tests
        - NO_BOARD env var