2020-07-03: 2.0.0 Beta 1 (5ab14ad7)
- Initial version

2020-07-07: 2.0.0 Beta 2 (9dd14579)
- Add more callback documentation to the READMEs
- Rename hal_arduino_avr to hal_arduino
- Fix timeouts caused by leaving the state machine in a wrong state

2020-07-21: 2.0.0 Beta 3 (3a47eea4)
- Add polling feature to callback handling
- Add tf_hal_callback_tick

2020-07-22: 2.0.0 Beta 4 (f5f88802)
- Fix tf_hal_callback_tick

2020-07-30: 2.0.0 Beta 5 (6fb54a57)
- Allow passing NULL as return parameter to ignore a result
- Add tf_hal_get_error_counters
- Fix deadline overflow behaviour
- Add hal_raspberry_pi

2020-07-31: 2.0.0 Beta 6 (f4e4e196)
- Fix nonnull attributes in HALs

2020-09-02: 2.0.0 Beta 7 (3a080018)
- Add hal_stm32f0
- Add examples
- Add documentation
- Add TF_IMPLEMENT_STRERROR config
- Replace usage of vsnprintf with custom printf implementation
- Remove tf_strerror, use tf_hal_strerror instead
- Rename tf_hal_*_init to tf_hal_create
- Fix bugs to allow running multiple HAL instances at the same time

2020-09-10: 2.0.0 Beta 8 (<unknown>)
- Fix bug where callbacks stopped working after 35 minutes
