v0.6.2

* Fix Python 3.5 compatibility

v0.6.1

* Register and unregister commands are now automatically combined to avoid
  sending many registration messages on application startup.

v0.6.0

* If not specified, the Qth library now defaults to using the QTH_HOST and
  QTH_PORT environment variables to set the MQTT server hostname and port
  number.

v0.5.0

Add on_unregister and delete_on_unregister options to enable clients instruct
the Qth registrar to delete or set properties or send events upon
client disconnection.

v0.4.1

Just PEP8 fixes to code formatting.

v0.4.0

The client now appends a random suffix to the provided client ID by default.

v0.3.0

* Adds delete_property()
* Fixes un-registration.

v0.2.0

Adds `qth.DIRECTORY` constant.

v0.1.0

Initial release.