Small change for python3

Thank you for this nice lib.

For installation on raspberry 4 with libreelec a small thing must be changed

import sys
sys.path.append('/storage/.kodi/addons/virtual.system-tools/lib')
import smbus
import time
sys.path.append('/storage/.kodi/addons/virtual.rpi-tools/lib')
import RPi.GPIO as GPIO


in si4703SetChannel  
    newChannel //= 10; # e.g. 980 / 10 = 98
 
Martin