5.5.2 Fix Timeout Argument + Receive all Messages

This release fixes an issue that resulted in timeout argument being effectively ignored. It also changes the loop behavior to have callbacks for all messages in the queue rather than just the first one in the queue. Thank you @calcut

To use in CircuitPython, simply install the Adafruit CircuitPython Bundle.

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

Read the docs for info on how to use it.