NanoMQ v0.7.0 Release Note

NanoMQ 0.7.0 changelog:

1. New MQTT V5 features: (Topic alias & Subscription Identifier & Retain As Published & Retain handling)
2. New Data persistence database: SQLite3 as data persistence option for QoS message.
3. New feature for bridging connection: the bridging client will store QoS message in SQLite if the ACK is missing.
4. New nng/ZeroMQ messaging proxy: convert message between nanomsg/nng(Pub/Sub & Pair1/Pair0) or ZeroMQ (Pub/Sub) to MQTT bidirectional.
5. Demo version of MQTT WebHook.
6. Fix MQTT v5 compatibility in TLS/WEbsocket port.
7. Optimize the zero-copy feature.
8. Fix other minor bugs.