3.1.0

• Updated MicroCore to v2.0.2 (release notes)
• The bootloader size for MCUdude's cores is now calculated dynamically (#207, #217)
• Minor fixes and improvements

Minor releases of MCUdude's cores:

• MightyCore v2.0.8 (release notes)
• MiniCore v2.0.9 (release notes)
• MegaCore v2.0.6 (release notes)
• MajorCore v2.0.5 (release notes)