Updated README example to use 50 kHz I2C frequency per datasheet recommendation. Thanks cHemingway!
To use in CircuitPython, simply install the [Adafruit CircuitPython Bundle](https://circuitpython.org/libraries).
To use in CPython, `pip3 install adafruit-circuitpython-scd30`.
Read the [docs](http://circuitpython.readthedocs.io/projects/scd30/en/latest/) for info on how to use it.