The API of `adafruit_lsm6ds` has changed, necessitating a change in the example code. In addition, there are other changes due to new pylint checks. Only the code in `examples/` has changed. The library code in `adafruit_ble/` is the same.
To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://circuitpython.org/libraries).
To use in CPython, `pip3 install adafruit-circuitpython-ble-adafruit`.
Read the [docs](http://circuitpython.readthedocs.io/projects/ble-adafruit/en/latest/) for info on how to use it.