Added command to get the rfspy version number, just to check if comms over serial are working
Added command to get the rfspy version number, just to check if comms over serial are working

oskarpearson/subg_rfspy,oskarpearson/subg_rfspy,ps2/subg_rfspy,ps2/subg_rfspy,oskarpearson/subg_rfspy,ps2/subg_rfspy