Adafruit-circuitpython-minimqtt

This release contains a new automated test to validate the backoff functionality and a fix for SUBACK messages. Thank you vladak!

To use in CircuitPython, simply install the [Adafruit CircuitPython Bundle](https://circuitpython.org/libraries).

To use in CPython, `pip3 install adafruit-circuitpython-minimqtt`.

Read the [docs](http://circuitpython.readthedocs.io/projects/minimqtt/en/latest/) for info on how to use it.

This release adds a new argument `is_ssl` that can be used to enable or disable ssl connection for any port. Also removed an unused internal function. Thank you vladak!

To use in CircuitPython, simply install the [Adafruit CircuitPython Bundle](https://circuitpython.org/libraries).

To use in CPython, `pip3 install adafruit-circuitpython-minimqtt`.

Read the [docs](http://circuitpython.readthedocs.io/projects/minimqtt/en/latest/) for info on how to use it.

What's Changed
* use NullHandler for logging by default by vladak in https://github.com/adafruit/Adafruit_CircuitPython_MiniMQTT/pull/150


**Full Changelog**: https://github.com/adafruit/Adafruit_CircuitPython_MiniMQTT/compare/7.2.1...7.2.2

What's Changed
* add missing logger check by vladak in https://github.com/adafruit/Adafruit_CircuitPython_MiniMQTT/pull/152


**Full Changelog**: https://github.com/adafruit/Adafruit_CircuitPython_MiniMQTT/compare/7.2.0...7.2.1

This release implements exponential backoff logic when connecting to MQTT server. Thank you vladak!

To use in CircuitPython, simply install the [Adafruit CircuitPython Bundle](https://circuitpython.org/libraries).

To use in CPython, `pip3 install adafruit-circuitpython-minimqtt`.

Read the [docs](http://circuitpython.readthedocs.io/projects/minimqtt/en/latest/) for info on how to use it.

Added preliminary type annotations for this library. Thanks vladak!

To use in CircuitPython, simply install the [Adafruit CircuitPython Bundle](https://circuitpython.org/libraries).

To use in CPython, `pip3 install adafruit-circuitpython-minimqtt`.

Read the [docs](http://circuitpython.readthedocs.io/projects/minimqtt/en/latest/) for info on how to use it.