Commits on Jul 6, 2024

1. Update PlatformIO.md …

   Added a bit more information in regards to using SerialUPDI in PlatformIO since i struggled a bit in getting it to work. 
   
   The custom method was inspired by [Henry Cheung](https://www.e-tinkers.com/2023/03/make-megatinycore-work-for-platformio/)'s blog post, and allows you to use this core's uploader with very little hassle, but i would suggest simply using the `serialupdi` upload protocol which worked well enough for my purposes.

   

   Elon61 authored Jul 6, 2024
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