This release changes the `i2c_bus` argument to be `i2c` instead which matches all other driver libraries. If your code explicitly used the keyword argument `i2c_bus` you'll need to change it to `i2c`. If your code doesn't use the name specifically then no change should be required and driver should still work the same.
To use in CircuitPython, simply install the [Adafruit CircuitPython Bundle](https://circuitpython.org/libraries).
To use in CPython, `pip3 install adafruit-circuitpython-bh1750`.
Read the [docs](http://circuitpython.readthedocs.io/projects/bh1750/en/latest/) for info on how to use it.