Added support for Hub2.
What's Changed
* Bugfix by iCarrot0605 in https://github.com/iCarrot0605/Switchbot_utility/pull/22
* Added support for Hub2 by iCarrot0605 in https://github.com/iCarrot0605/Switchbot_utility/pull/23
**Full Changelog**: https://github.com/iCarrot0605/Switchbot_utility/compare/0.3.1...0.4