Update paho-mqtt to 1.6.1

[pyup-bot]

This PR updates paho-mqtt from 1.5.1 to 1.6.1.

Changelog

1.6.1

===================

- Fix Python 2.7 compatilibity.

1.6.0

===================

- Changed default TLS version to 1.2 instead of 1.0.
- Fix incoming MQTT v5 messages with overall property length > 127 bytes being
incorrectly decoded. Closes 541.
- MQTTMessageInfo.wait_for_publish() and MQTTMessageInfo.is_published() will
now raise exceptions if called when the publish call produced an error.
Closes 550.
- Remove periodic retry checks for outgoing messages with QoS>0. This means
that outgoing messages will only be retried on the client reconnecting to
the server. They will *not* be retried when the client is still connected.
- The `rc` parameter in the `on_disconnect` callback now has meaningful values
in the case of an error. Closes 441.
- Callbacks can now be applied to client instances using decorators.
- PUBACK messages are now sent to the broker only after the on_message
callback has returned.
- Raise exceptions when attempting to set MQTT v5 properties to forbidden
values. Closes 586.
- Callbacks can now be updated from within a callback.
- Remove _out_packet_mutex and _current_out_packet_mutex and convert the
_out_packet queue use to thread safe.
- Add basic MQTT v5 support to the subscribe and publish helper functions.
Closes 575.
- Fix on_disconnect() sometimes calling the MQTT v3.x callback when it should
call the MQTT v5 callback. Closes 570.
- Big performance improvement when receiving large payloads, particularly for
SSL. Closes 571,
- Fix connecting with MQTT v5 to a broker that doesn't support MQTT v5.
Closes 566.
- Removed ancient Mosquitto compatibility class.
- Fix exception on calling Client(client_id="", clean_session=False).
Closes 520.
- Experimental support for Websockets continuation frames. Closes 500.
Closes 89.
- `Properties.json()` now converts Correlation Data bytes() objects to hex.
Closes 555.
- Only use the internal sockpair wakeup when running with loop_start() or
loop(). This removes problems when running with an external event loop.
- Drain all of sockpairR bytes to avoid unnecessary wakeups and possible
timeouts. Closes 563.
- Add timeout to MQTTMessageInfo:wait_for_publish().

Links

• PyPI: https://pypi.org/project/paho-mqtt
• Changelog: https://pyup.io/changelogs/paho-mqtt/
• Homepage: http://eclipse.org/paho

[codecov-commenter]

Codecov Report

Merging #488 (8869774) into master (247e7b4) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #488   +/-   ##
======================================
  Coverage    56.7%   56.7%           
======================================
  Files         143     143           
  Lines       10641   10641           
======================================
  Hits         6039    6039           
  Misses       4602    4602           

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