NanoMQ v0.7.2 更新日志

NanoMQ 0.7.2 changelog:

New MQTT V5 features: (Topic alias & Subscription Identifier & Retain As Published & Retain handling) New Data persistence database: SQLite3 as data persistence option for QoS message. New feature for bridging connection: the bridging client will store QoS message in SQLite if the ACK is missing. New nng/ZeroMQ messaging proxy: convert message between nanomsg/nng(Pub/Sub & Pair1/Pair0) or ZeroMQ (Pub/Sub) to MQTT bidirectional. Demo version of MQTT WebHook. Fix MQTT v5 compatibility in TLS/WEbsocket port. Optimize the zero-copy feature. Fix data racing in mutex & message lost when exceeding the max limit of lmq(msq_len).