Teensyduino 1.51
Changes since 1.50
Support for Arduino 1.8.12
Add USB Flight Sim for Teensy 4.0 (Jorg Neves Bliesener)
fix panic temperature power off on Teensy 4.0 (FrankB)
SerialFlash support AT25SF128A (FrankB)
Wire lib minor updates
Drop support for Arduino 1.8.7 and 1.8.8 and 1.8.10
Fix analog comparator IRQ names (sgorsh)
Limit shiftOut to 10 MHz (FrankB)