Version 4.4.0

This is the first release of the MQTT CLI which is coupled with the HiveMQ 4.4.0 release.
To match the version of the release the MQTT CLI version is also bumped to 4.4.0

⭐️ Features

• Add $ mqtt hivemq export clients command to export client details from a HiveMQ API endpoint #151, #157

🔧 Changes

• All Commands now support the logToLogfile option -l to activate logging to logfile at $HOME/.mqtt-cli/logs #150
• Add $ mqtt hivemq command which is the entry point for all future hivemq related commands #157
• Add $ mqtt hivemq export command which is the entry point for all future hivemq related export commands #157

🐞 Bug-Fixes

• Test Command does not print stack-traces on errors anymore #144, #150
• The publish, subscribe and shell command do not log to a logfile by default anymore #157