THIS RELEASE CHANGES THE API. You must update your code to match:
* `co2eq` updated to `eCO2`.
* `tvoc` updated to `TVOC`.
Updated property names to match design guidelines.
To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://github.com/adafruit/Adafruit_CircuitPython_Bundle).
To use in CPython, `pip3 install adafruit-circuitpython-sgp30`.
Read the [docs](http://circuitpython.readthedocs.io/projects/sgp30/en/latest/) for info on how to use it.