rumqttc 0.22.0

Added

• Added outgoing_inflight_upper_limit to MQTT5 MqttOptions. This sets the upper bound for the number of outgoing publish messages (#615)
• Added support for HTTP(s) proxy (#608)
  • Added proxy feature gate
  • Refactored eventloop::network_connect to allow setting proxy
  • Added proxy options to MqttOptions
• Update rustls to 0.21 and tokio-rustls to 0.24 (#606)
  • Adds support for TLS certificates containing IP addresses
  • Adds support for RFC8446 C.4 client tracking prevention

Changed

• MqttState::new takes max_outgoing_packet_size which was set in MqttOptions but not used (#622)