f examples/firmware_swapping: change versions to 1 and 2
f examples/firmware_swapping: change versions to 1 and 2

jbeyerstedt/RIOT-OTA-update,jbeyerstedt/RIOT-OTA-update,jbeyerstedt/RIOT-OTA-update,jbeyerstedt/RIOT-OTA-update,jbeyerstedt/RIOT-OTA-update