2013-10-18: 2.0.0 (bbeb26f)
- Initial version

2013-12-09: 2.0.1 (902c1e7)
- Fix morse-code-overwrite bug

2014-08-19: 2.0.2 (5b93ea3)
- Duration 0 stops beep, duration UINT32_MAX results in an infinite beep

2019-08-19: 2.0.3 (909d5a3)
- Don't disable IRQs during calibration, since newer Brick versions use
  interrupts during I2C communication