Adafruit-circuitpython-thermistor

Change to add high_side boolean to initializer. This defaults to true and keeps the old behavior of the library which assumes a high side connection (thermistor from ADC input up to high logic/5 or 3.3 volts). However if high_side is set to false the logic changes appropriately so a low side connected thermistor (ADC input down to ground) works correctly too. No functional change for current library users--the default high side parameter will behave exactly as before.

This is a new release to trigger mpy generation with CircuitPython 2.0+ compatible mpy files. No functional change to the code.

This requires [CircuitPython](https://github.com/adafruit/circuitpython/releases) 0.9.4+!

* Switch to `nativeio` split APIs.

Second release for TravisCI generation. Requires CircuitPython 0.9.4!

Driver works. :-)