0.21

The is a minor release, it addresses an issue with DefaultPinger that could lead to the connection being dropped in error. It also sets the required minimum version of Go to 1.21.

What's Changed

• Resolve erroneous ping timeout by @MattBrittan in #238
• Remove MaximumQoS property from CONNECT packet #161 by @tomatod in #243
• Update dependencies and set go.mod to go 1.21 by @MattBrittan in #245

Full Changelog: v0.20.0...v0.21.0