------
- Feature: Allow unsubscribing from notifications.
- Improvement: Allow more time to discover characteristics. [GATTTOOL]
- Improvement: Allow using gatttol backend without root. [GATTTOOL]
- Improvement: Standardize type of UUID so comparison always works (str
vs unicode)
- Fix: Fix packaging so the version on PyPI can be installed.
- Fix: Fix Python 3 compatibility.
Thanks to Ilya Sukhanov and Alexey Roslyakov for the changes in this
release!