CS can be on any GPIO pin. Board.CE0 is a poor choice in the examples. Updated examples to use D20 instead, with a comment that any available GPIO pin can be used.
1.0.6
The write_then_readinto() function does not appear to reliably read the registers. Revert the change to Write & Read Register using write_then_readinto back to an explicit write() followed by a readinto().
1.0.5
Changed the I2C logic to use write_then_readinto() function, rather than a write() followed by read().
1.0.4
Updated code with some minor fixes for some issues and updated the build process to the new Adafruit build process.
1.0.3
Updated the tune_cap property to return and set the tuning capacitor value in pF.