Bug fixes

model.set_measurement_handler() is no longer required for raw BleakClient, because it didn't make sense to have it to begin with.
Notebooks have been updated with this change.

v0.2.0: Context manager, simplified BleakModel instantiation.

(manual github release to correspond with pypi)

Breaking changes:

• model = BleakModel() no longer requires import machine; machine.add_model(model) after instantiation.

New features:

• Context manager. When the async with model: block is exited, the model is cleaned up automatically.