Revision history for RPi-WiringPi-Constant
1.02    2018-10-26
        - added deprecation warnings in POD
1.01    2017-07-08
        - added new tag :pwm_mode that contains the values for setting the PWM
          mode to either MS (mark-space) or BAL (balanced) mode
1.00    2017-06-24
        - added new tag :altmode that contains the value for the Pi pin ALT
          modes
0.02    unknown
        - added edge detection constants
        - added PUD constants
        - added setup mode constants
0.01    unknown
        - first version, released on an unsuspecting world.