Update README.md

Version was misspelled. That's it.
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@ -24,7 +24,7 @@ http://vocke.tv/lib/exe/fetch.php?media=20150722_hoverboard_sch.pdf
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#### Flashing
To build the firmware, just type "make". Make sure you have specified your gcc-arm-none-eabi binary (verion 7 works, there is a version that does not!) location in the Makefile ("PREFIX = ..."). Right to the STM32, there is a debugging header with GND, 3V3, SWDIO and SWCLK. Connect GND, SWDIO and SWCLK to your SWD programmer, like the ST-Link found on many STM devboards.
To build the firmware, just type "make". Make sure you have specified your gcc-arm-none-eabi binary (version 7 works, there is a version that does not!) location in the Makefile ("PREFIX = ..."). Right to the STM32, there is a debugging header with GND, 3V3, SWDIO and SWCLK. Connect GND, SWDIO and SWCLK to your SWD programmer, like the ST-Link found on many STM devboards.
Make sure you hold the powerbutton or connect a jumper to the power button pins while flashing the firmware, as the STM might release the power latch and switches itself off during flashing. Battery > 36V have to be connected while flashing.