Fixed an error where the user was not able to set the PWM Frequency.
Thanks MaxBec
To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://circuitpython.org/libraries).
To use in CPython, `pip3 install adafruit-circuitpython-emc2101`.
Read the [docs](http://circuitpython.readthedocs.io/projects/emc2101/en/latest/) for info on how to use it.