[ update ] README, STM32F439VIT6 working as reported by Pawel Kraszewski
[ update ] README, STM32F439VIT6 working as reported by Pawel Kraszewski

trigrass2/stlink,12019/stlink,fedorcomander/stlink,braincorp/stlink,chaosAD/stlink,gtalusan/stlink,ros2/stlink,12019/stlink,braincorp/stlink,simonjwright/stlink,simonjwright/stlink,fedorcomander/stlink,trigrass2/stlink,swegener/stlink,chaosAD/stlink,gtalusan/stlink,ros2/stlink,swegener/stlink