0.30.0

What's Changed

• Make LWT alive/dead payload configurable. Thanks, @sumnerboy12.
• Upgrade to future>=0.18.0,<1. Thanks, @arieroos.
• Several adjustments to log messages
• Several improvements to the test harness, code coverage, project tooling,
  code linting and formatting, and CI
• Refactoring of some data model components
• Fix job sorting by priority after migration to Python 3
• Remove some Python 2 compatibility snippets. mqttwarn is Python 3 only.

Breaking changes

• Rework and rename service plugin osxnotify to desktopnotify, it
  should work on all popular operating systems now. Thanks, @portalzine.

New Contributors

• @portalzine made their first contribution in #582
• @arieroos made their first contribution in #585

Full Changelog: 0.29.1...0.30.0