1.2.0

• Optimized ISR routines
• Reduced RAM footprint
• fixed a race condition between reading microsAtLastPulse and micros()

1.1.1

• fixed compilation errors on SAM-based boards (Due/MKR)
• improved comments and documentation
• fixed potential race condition in access to microsAtLastPulse

1.0.0

First release (hopefully) compatible with Arduino library manager