- Added new Adafruit boards: Crickit M0, Grand Central M4 (SAMD51), Trellis M4 (SAMD51)
- Added support for Arduino MKR NB 1500 and LowPowerLab CurrentRanger
- Allowed configuring upload offset address using
board_upload.offset_address
option - Updated Arduino SAMD core to v1.6.20
- Updated Arduino SAM core to v1.6.12
- Updated Adafruit core to v1.2.9
- Removed Black Magic Probe form SAMD51 based boards
- Fixed microcontroller type for ItsyBitsy M4 Express
- Fixed warning about "Unknown upload protocol custom"