Possible typo in supported board list

[alextrical]

Hi All

Just been looking through the list of supported Chips, and it looks like there may be a typo, as I don't believe this chip exists, when comparing against the STM32 stock list?

[ABOSTM]

Hi @alextrical,
You are right, it is a typo, thanks for highlighting it.
It should be STM32F217ZG
as well as STM32F207G should be replaced by STM32F207ZG.

Would you submit a PR to fix this ? (in Readme.txt)

[ABOSTM]

Fixed thanks to #1788