Support newer firmware revision #27
Description
At some point, Cirque updated the Pinnacle IC's firmware (exact date is unknown).
This newer firmware no longer supports ERA (publicly) and using a software-based "data read"y flag.
The next major release should correctly identify which firmware revision (in begin()) is deployed and dynamically adjust API behavior accordingly.
See 2bndy5/CircuitPython_Cirque_Pinnacle#15 for more detail and 2bndy5/CircuitPython_Cirque_Pinnacle#14 for hardware test results.