MegaCore v2.0.3
Changelog:
- Update Optiboot flash
- Update corefiles
- Update Wire library to reflect the official version
- Add programmers
- Mandatory in the next release of Arduino IDE (1.8.13)
- Add PIN macros
- You can now refer to pins by writing PIN_PB0
- Add 4, 2 and 1 MHz external oscillator options
- Add 4 and 2 MHz internal oscillator options