Airthings-ble

**Full Changelog**: https://github.com/vincegio/airthings-ble/compare/v0.5.6-3...v0.5.6-4

**Full Changelog**: https://github.com/vincegio/airthings-ble/compare/v0.5.6-2...v0.5.6-3

Fix
* Update the notification receiver to wait until the full message is received before return ([8](https://github.com/vincegio/airthings-ble/issues/8)) ([`67e3ff7`](https://github.com/vincegio/airthings-ble/commit/67e3ff743adcfed6494d79354f252d056d1d21d7))

Fix
* Properly disconnect when there is an exception reading device state ([7](https://github.com/vincegio/airthings-ble/issues/7)) ([`3b8de60`](https://github.com/vincegio/airthings-ble/commit/3b8de60b7a13a5a174819404b9b51f66674847a5))

Fix
* Gracefully delete date_time ([3](https://github.com/vincegio/airthings-ble/issues/3)) ([`e5ca63f`](https://github.com/vincegio/airthings-ble/commit/e5ca63f75044e4cb6f31d6b1ed55d2154f9acaa2))