[FR] Please update Arduino_Core_STM32 to latest version

[LinoBarreca]

We need SoftwareSerial as we specify here
teemuatlut/TMCStepper#75
and it has already been merged here
stm32duino/Arduino_Core_STM32#645
on sept 11.

Thanks

[valeros]

Hi @LinoBarreca ! It's already updated but not yet released. You can try with upstream version:

[env:upstream_develop]
platform = https://github.com/platformio/platform-ststm32.git
board = ...