replace pyserial-asyncio with pyserial-asyncio-fast (#178)

* replace pyserial-asyncio with pyserial-asyncio-fast

* fix CI

* fix async tests

Zigpy serial protocol (#177)

* Migrate `Gateway`

* Migrate API and Application

* Bump minimum zigpy version

* Get rid of unnecessary probe tests

* Fix unit tests

* Increase test coverage

* Use correct data type when clearing buffer

Do not double convert `config` (#176)

* Do not double convert config

* Disable OTA in unit tests

Disable the watchdog task until a stable solution is found (#172)

Sync up with zigpy 0.60.0 (#170)

* Sync up with zigpy 0.60.0

* Fix unit tests

* Add remaining unit tests

* Fix watchdog unit test

* Re-add XBee config

Fix energy scan duraton (#168)

bump static code checkers (#164)

Merge pull request #152 from puddly/rc

0.18.3 Release

Merge pull request #146 from puddly/rc

0.18.2 Release

Merge pull request #143 from puddly/rc

0.18.1 Release