Update kl25z repeater README.
Update kl25z repeater README.

UKHASnet/UKHASnet_Firmware,dbrooke/UKHASnet_Firmware,dbrooke/UKHASnet_Firmware,sburggsx/UKHASnet_Firmware,sburggsx/UKHASnet_Firmware,UKHASnet/UKHASnet_Firmware