update README, NUCLEO-F072RB as reported by kwikius
update README, NUCLEO-F072RB as reported by kwikius

chaosAD/stlink,12019/stlink,fedorcomander/stlink,simonjwright/stlink,simonjwright/stlink,braincorp/stlink,chaosAD/stlink,swegener/stlink,trigrass2/stlink,gtalusan/stlink,braincorp/stlink,swegener/stlink,gtalusan/stlink,fedorcomander/stlink,12019/stlink,trigrass2/stlink