Sourced from paho-mqtt's changelog.

v1.x.x - 20xx-xx-xx

• Exceptions that occur in callbacks are no longer suppressed by default. They can optionally be suppressed by setting client.suppress_exceptions = True. Closes #365.
• Fix PUBREL remaining length of > 2 not being accepted for MQTT v5 message flows. Closes #481.

v1.5.0 - 2019-10-30

• Add support for clean_session on subscribe helper. Closes #219
• Add support for non-standard bridge connection. Closes #282
• Fix hang with QoS 2 message and clean_session = False. The fix replace hang with message DROP. See README for known limitation. Closes #284 and #286
• Fix connection establishement timeout. Closes #291 and #288
• Add support for connecting through a proxy. Closes #315
• Add MQTT v5 support. Closes #334
• Improve error message when sending queue is full. Closes #378
• Improve error handling during initialization on edge case. Closes #387 and #388
• Allow to specify local client port used (similar to bind_address). Closes #390
• Add method is_connected to know if MQTT connection is established. Closes #414
• Set connection timeout to keepalive. Closes #425

v1.4.0 - 2018-09-02

• Fix hang when client restarted and broker resumed a session with Qos2 message. Closes #284. Note: this change replace the hang by a message lost ! See README for current limitation of paho-mqtt.
• Fix reconnection loop when a clean_session=True client reconnect while Qos2 message are being sent. Note: this change replace the infinite reconnection loop by a possible duplicate QoS2 message. Only clean_session=True client are affected, see README for current limitation of paho-mqtt.
• Catch and log any exception raised by user callback. Closes #294.
• Improve support for external event loop (like asyncio). Closes #235.
• Fix order of message with publish.multiple helper. Closes #87.
• Fix hang on wait_for_published() on bad network. Closes #309.
• Fix an issue with Websocket that seems to happen only on Windows. Closes #268.
• Fix issue with Websocket payload size between 127 and 65536. Closes #267.
• Closes socket in client destructor to avoid FD leak. Closes #170.
• Fix uncaught timeout exception during connection. Closes #288.
• Remove dup flag on PUBREL packet. Closes #298.
• Use secure entropy source for Websocket mask_key (urandom). Closes #305.

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